Information processing apparatus, control method, and program

ABSTRACT

An information processing apparatus (2000) includes a first analyzing unit (2020), a second analyzing unit (2040), and an estimating unit (2060). The first analyzing unit (2020) calculates a flow of a crowd in a capturing range of a fixed camera (10) using a first surveillance image (12). The second analyzing unit (2040) calculates a distribution of an attribute of objects in a capturing range of a moving camera (20) using a second surveillance image (22). The estimating unit (2060) estimates an attribute distribution for a range that is not included in the capturing range of the moving camera (20).

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a continuation application of U.S. patentapplication Ser. No. 17/742,607 filed on May 12, 2022, which is acontinuation application of U.S. patent application Ser. No. 16/444,417filed on Jun. 18, 2019, which is issued as U.S. Pat. No. 11,361,452,which is a continuation application of U.S. patent application Ser. No.16/085,851 filed on Sep. 17, 2018, which is issued as U.S. Pat. No.10,699,422, which is a National Stage Entry of international applicationPCT/JP2017/002711 filed on Jan. 26, 2017, which claims the benefit ofpriority from Japanese Patent Application 2016-055171 filed on Mar. 18,2016, the disclosures of all of which are incorporated in their entiretyby reference herein.

TECHNICAL FIELD

The present invention relates to video surveillance.

BACKGROUND ART

Technologies for analyzing a video of a surveillance camera have beendeveloped. For example, Patent Document 1 discloses a technique forsurveilling the congestion degree and the like in a certain space byrecognizing the number, density, average velocity, and average motionvector of people and the like in a crowd using a video of a surveillancecamera.

RELATED DOCUMENT Patent Document

[Patent Document 1] Japanese Patent Application Publication No.2003-348569

[Patent Document 2] International Publication No. 2014/207991

[Patent Document 3] Japanese Unexamined Patent Application Publication(Translation of PCT Application) No. 2014-517371

SUMMARY OF THE INVENTION Technical Problem

In the technique of Patent Document 1, a crowd is handled as acollection of the same things without distinguishing people included inthe crowd from each other. Thus, it is impossible to grasp what kind ofpeople are included in the crowd using the technique of PatentDocument 1. In addition, the technique of Patent Document 1 is atechnique for detecting a person or a thing (or a collection of peopleor things) by individually separating the person or the thing. Thus, ina state of a crowd where people cannot be individually separated fromeach other easily due to a large number of people, it is difficult tocorrectly determine the number of people or the like.

Patent Document 2 discloses a method of recognizing a crowd as a masswithout separating each person in the crowd of people. When this methodis used, the number or density of people can be estimated in a statewhere people overlap each other. However, as in Patent Document 1, sincethe crowd is treated as a mass of the same things, it is impossible tograsp what kind of people are included in the crowd.

On the other hand, Patent Document 3 discloses a method of selecting anadvertisement to be provided to a person by estimating attributeinformation such as the age, the sex, and the like of the person. In thetechnique of Patent Document 3, merely a part of a person such as a faceis recognized. Thus, the position of the person cannot be accuratelyacquired. In addition, the flow of a crowd cannot be calculated in thetechnique of Patent Document 3. Thus, while the attributes of a personpresent in a location where an advertisement is provided can bedetermined, it is impossible to estimate what kind of people are presentin other locations.

The invention is conceived in view of the above problems. An object ofthe invention is to provide a technique for grasping the distribution ofan attribute of objects in detail.

Solution to Problem

An information processing apparatus of the invention includes (1) afirst analyzing unit that calculates a flow of a collection of objectsin a capturing range of a fixed camera using a first surveillance image,the first surveillance image being generated by the fixed camera, thefixed camera being a camera a position of which is fixed, (2) a secondanalyzing unit that calculates a distribution of an attribute of objectsin a capturing range of a moving camera using a second surveillanceimage, the second surveillance image being generated by the movingcamera, the moving camera being a camera a position of which is notfixed, and (3) an estimating unit that estimates the distribution of theattribute of the objects for an estimation range including a range notincluded in the capturing range of the moving camera based on thedistribution of the attribute of the objects in the capturing range ofthe moving camera and the flow of the collection of objects in thecapturing range of the fixed camera.

A control method of the invention is executed by a computer. The controlmethod includes (1) a first analyzing step of calculating a flow of acollection of objects in a capturing range of a fixed camera using afirst surveillance image, the first surveillance image being generatedby the fixed camera, the fixed camera being a camera a position of whichis fixed, (2) a second analyzing step of calculating a distribution ofan attribute of objects in a capturing range of a moving camera using asecond surveillance image, the second surveillance image being generatedby the moving camera, the moving camera being a camera a position ofwhich is not fixed, and (3) an estimating step of estimating thedistribution of the attribute of the objects for an estimation rangeincluding a range not included in the capturing range of the movingcamera based on the distribution of the attribute of the objects in thecapturing range of the moving camera and the flow of the collection ofobjects in the capturing range of the fixed camera.

A program of the invention causes a computer to execute each step of thecontrol method of the invention.

Advantageous Effects of Invention

According to the invention, a technique for grasping a distribution ofan attribute of objects in detail is provided.

BRIEF DESCRIPTION OF THE DRAWINGS

The above object and other objects, features, and advantages will becomemore apparent from the following exemplary embodiments and the attacheddrawings.

FIG. 1 is a block diagram illustrating an information processingapparatus according to Example Embodiment 1.

FIG. 2 is a diagram schematically illustrating the operation of a fixedcamera and a moving camera.

FIG. 3 is a diagram schematically illustrating estimation performed byan estimating unit.

FIG. 4 is a diagram illustrating a computer for implementing theinformation processing apparatus.

FIG. 5 is a flowchart illustrating the flow of a process executed by theinformation processing apparatus of Example Embodiment 1.

FIG. 6 is a diagram illustrating an optical flow calculated for a firstsurveillance image.

FIG. 7 is a diagram illustrating a change in the position of an object.

FIGS. 8A and 8B are diagrams illustrating a scene in which an attributedistribution in an estimation range is estimated by moving an attributedistribution in a capturing range of the moving camera.

FIGS. 9A and 9B are diagrams illustrating a scene in which an attributedistribution in an estimation range is estimated by moving an attributedistribution in a capturing range of the moving camera.

FIGS. 10A and 10B are diagrams illustrating a scene in which themovement direction of the moving camera is estimated using mapinformation.

FIGS. 11A and 11B are diagrams illustrating a scene in which anattribute distribution is estimated for an estimation range having apredetermined shape and area.

FIGS. 12A and 12B are diagrams illustrating a scene in which anattribute distribution is estimated for an estimation range having thesame shape and area as a capturing range of the fixed camera.

FIG. 13 is a diagram illustrating a scene in which a crowd disperses astime elapses.

FIGS. 14A and 14B are diagrams illustrating a scene in which a pluralityof flows of crowds are present.

FIG. 15 is a diagram illustrating a scene in which a plurality of movingcameras are present.

FIGS. 16A-16C are diagrams illustrating a relationship between a time atwhich data is generated, and a time at which an attribute distributionis generated.

FIGS. 17A and 17B are diagrams illustrating a method of estimating anattribute distribution related to a certain time using data that isgenerated after the time.

FIG. 18 is a diagram illustrating a map that is displayed on a displaydevice.

FIG. 19 is a diagram illustrating the map on which an estimatedattribute distribution is superimposed.

FIG. 20 is a block diagram illustrating an information processingapparatus according to Example Embodiment 2.

FIGS. 21A to 21C are diagrams illustrating a scene in which a crowd thatis included in a capturing range of a moving camera is divided into aplurality of crowds having different attribute values.

FIG. 22 is a block diagram illustrating an information processingapparatus according to Example Embodiment 3.

DESCRIPTION OF EMBODIMENTS

Hereinafter, example embodiments of the invention will be describedusing the drawings. The same constituents will be designated by the samereference signs in all of the drawings, and descriptions of suchconstituents will not be repeated.

Example Embodiment 1

FIG. 1 is a block diagram illustrating an information processingapparatus 2000 according to Example Embodiment 1. In FIG. 1 , each blockrepresents a configuration of a function unit and not a configuration ofa hardware unit.

The information processing apparatus 2000 uses two types of surveillanceimages including a surveillance image generated by a fixed camera and asurveillance image generated by a moving camera. The fixed camera is acamera the position of which is fixed. For example, the fixed camera isa surveillance camera that is fixedly installed at various locationssuch as a wall, a post, or a ceiling. Note that the location where thefixed camera is installed may be an indoor location or an outdoorlocation. The wall or the like to which the fixed camera is attached isenough to be fixed for a certain period, and it is not limited to animmovable thing. For example, the wall or the like where the fixedcamera is installed may be a partition, a post, or the like that istemporarily installed in an event venue and the like. Alternatively, amoving object equipped with a camera that can be used as the movingcamera, described later, may be caused to stop at a certain location,and the camera may be used as the fixed camera. The moving object is,for example, a vehicle, a motorcycle, a robot, or a flying object (forexample, a drone and an airship).

The moving camera is a camera the position of which is moved. Forexample, the moving camera is attached to the body of a person orattached to the moving object and the like. The moving camera that isattached to the body of a person is, for example, a camera that is heldby a hand (a video camera and a camera of a portable terminal such as asmartphone), or a camera that is fixed to a head, a chest, or the like(a body-worn camera and the like). The camera that is attached to avehicle, a motorcycle, a robot, a flying object, or the like may be acamera that is attached to be used as a so-called drive recorder, or maybe a camera that is separately attached for video surveillance.

Both of the moving camera and the fixed camera capture the location of asurveillance target as a video. The location of the surveillance targetis not limited. For example, the location of the surveillance target isa path between an event venue and its closest station. Note that thelocation of the surveillance target may be an indoor location or anoutdoor location.

FIG. 2 is a diagram schematically illustrating the operation of thefixed camera and the moving camera. A fixed camera 10 generates a firstsurveillance image 12 by capturing a collection of objects (crowd). Eachobject may be a person or a thing other than a person (for example, avehicle, a motorcycle, and an animal). A moving camera 20 generates asecond surveillance image 22 by capturing a crowd.

The capturing ranges of the fixed camera 10 and the moving camera 20 mayoverlap each other or may not overlap each other. The crowd captured bythe fixed camera 10 and the crowd captured by the moving camera 20 mayhave a common part or may not have a common part.

The number of fixed cameras 10 may be one or more than one. The numberof moving cameras 20 may be one or more than one. In addition, thenumber of fixed cameras 10 may be the same as or different from thenumber of moving cameras 20.

The information processing apparatus 2000 has a first analyzing unit2020, a second analyzing unit 2040, and an estimating unit 2060. Thefirst analyzing unit 2020 calculates the flow of the crowd in thecapturing range of the fixed camera 10 using the first surveillanceimage 12.

The second analyzing unit 2040 calculates the distribution of anattribute of each object in the capturing range of the moving camera 20using the second surveillance image 22. The attribute of each object isa feature of each object. For example, in a case where each object is aperson, an age bracket is one example of the attribute.

The distribution of the attribute of the objects in a certain rangerepresents “the degree to which objects having a certain attribute isincluded in the range”. For example, assume that each object is aperson, and the attribute is an age bracket. In this case, the attributeof the objects is, for example, “the ratio of children to adultsincluded in the capturing range of the moving camera 20”. Hereinafter,the distribution of the attribute of the objects will be referred to asan “attribute distribution”.

The estimating unit 2060 estimates the attribute distribution for arange that is not included in the capturing range of the moving camera20. Hereinafter, the range in which the estimating unit 2060 estimatesthe attribute distribution will be referred to as an estimation range.Note that it is sufficient for the estimation range to include a rangethat is not included in the capturing range of the moving camera 20, andmay also include a range included in the capturing range of the movingcamera 20.

FIG. 3 is a diagram schematically illustrating estimation performed bythe estimating unit 2060. In FIG. 3 , a crowd is included in both thecapturing range of the fixed camera 10 and the capturing range of themoving camera 20. In addition, in FIG. 3 , the capturing range of thefixed camera 10 is wider than the capturing range of the moving camera20.

The first analyzing unit 2020 calculates the flow of the crowd using thefirst surveillance image 12 in which the crowd in a capturing range 14of the fixed camera 10 is captured. Consequently, the first analyzingunit 2020 determines a fact that the crowd moves in the rightwarddirection.

The second analyzing unit 2040 calculates the attribute distribution inthe crowd using the second surveillance image 22 in which the crowd in acapturing range 24 of the moving camera 20 is captured. Assume that thesecond analyzing unit 2040 calculates the attribute distribution as the“ratio of adults to children=3:2” for the capturing range 24.

From the fact that the crowd in the capturing range 14 of the fixedcamera 10 is moving in the rightward direction, and that the attributedistribution in the capturing range 24 of the moving camera 20 is the“ratio of adults to children=3:2”, the estimating unit 2060 predictsthat the attribute distribution as the “ratio of adults to children=3:2”will move in the rightward direction. Therefore, the estimating unit2060 estimates the attribute distribution to be the “ratio of adults tochildren=3:2” for an estimation range 60 that is on the right side fromthe capturing range 24 of the moving camera 20.

Note that the above example is an example for facilitating understandingof the operation of the information processing apparatus 2000 and is notintended to limit the operation of the information processing apparatus2000. The operation of the information processing apparatus 2000 will bedescribed in detail later.

Advantageous Effect

The information processing apparatus 2000 calculates the flow of thecrowd using the first surveillance image 12 generated by the fixedcamera 10. On the other hand, the information processing apparatus 2000calculates the attribute distribution of the objects included in thecrowd using the second surveillance image 22 generated by the movingcamera 20. The information processing apparatus 2000 estimates theattribute distribution for a range not included in the capturing rangeof the moving camera 20 based on the flow of the crowd calculated usingthe first surveillance image 12 and the attribute distributioncalculated using the second surveillance image 22. By doing so, theattribute distribution can be grasped for a wide range that cannot becovered by the moving camera 20. Consequently, the distribution of theattribute of the objects in a surveillance location can be grasped indetail.

Since the fixed camera 10 captures a large number of objects bycapturing a wide range, the first surveillance image 12 is suitable forthe purpose of calculating the flow of the whole crowd. In addition,since the angle of view of the fixed camera 10 is fixed, the position ofthe crowd can be accurately calculated using the first surveillanceimage 12. From this reason, the first surveillance image 12 is suitablefor the purpose of calculating the flow of the whole crowd.

On the other hand, since the moving camera 20 that is worn by a securityguard and the like can capture the objects at a short distance, eachobject is captured at a large size in the second surveillance image 22.Thus, the second surveillance image 22 is suitable for the purpose ofcalculating the feature (attribute) of the individual objects. Inaddition, since the position and direction of the moving camera 20 canbe easily changed, the attribute of the objects can be recognized byflexibly changing the location and direction of capturing anytime usingthe moving camera 20.

The information processing apparatus 2000 can accurately estimate thedistribution of the attribute of the objects by utilizing the feature ofeach of the fixed camera 10 and the moving camera 20 using the firstsurveillance image 12 and the second surveillance image 22.

Hereinafter, the present example embodiment will be described in furtherdetail.

Hardware Configuration Example of Information Processing Apparatus 2000

Each functional configuration unit of the information processingapparatus 2000 may be implemented by hardware (for example, a hardwiredelectronic circuit) that implements each functional configuration unit,or may be implemented by a combination of hardware and software (forexample, a combination of an electronic circuit and a programcontrolling the electronic circuit). Hereinafter, the implementation ofeach functional configuration unit of the information processingapparatus 2000 using a combination of hardware and software will befurther described.

FIG. 4 is a diagram illustrating a computer 1000 for implementing theinformation processing apparatus 2000. The computer 1000 is anycomputer. For example, the computer 1000 is a personal computer (PC), aserver machine, a tablet terminal, or a smartphone. The computer 1000may be a dedicated computer designed for implementing the informationprocessing apparatus 2000, or a general-purpose computer.

The computer 1000 has a bus 1020, a processor 1040, a memory 1060, astorage 1080, an input-output interface 1100, and a network interface1120. The bus 1020 is a data transfer path for transmitting andreceiving data among the processor 1040, the memory 1060, the storage1080, the input-output interface 1100, and the network interface 1120.However, the method of connecting the processor 1040 and the like toeach other is not limited to bus connection. The processor 1040 is anoperation processing device such as a central processing unit (CPU) or agraphics processing unit (GPU). The memory 1060 is a memory such as arandom access memory (RAM) or a read-only memory (ROM). The storage 1080is a storage device such as a hard disk, a solid state drive (SSD), or amemory card. The storage 1080 may also be a memory such as a RAM or aROM.

The input-output interface 1100 is an interface for connecting thecomputer 1000 to input and output devices. For example, a keyboard or amouse is connected to the input-output interface 1100.

The network interface 1120 is an interface for communicably connectingthe computer 1000 to external apparatuses. The network interface 1120may be a network interface for connection to a wired communication line,or a network interface for connection to a wireless communication line.

For example, the computer 1000 that implements the informationprocessing apparatus 2000 is connected to the fixed camera 10 and themoving camera 20 through a network. However, the method of connectingthe computer 1000 to the fixed camera 10 and the moving camera 20 is notlimited to connection through a network. In addition, the computer 1000may not be communicably connected to the fixed camera 10 and the movingcamera 20.

The storage 1080 stores a program module that implements each functionalconfiguration unit (the first analyzing unit 2020, the second analyzingunit 2040, and the estimating unit 2060) of the information processingapparatus 2000. The processor 1040 implements each functioncorresponding to the program module by reading each program module intothe memory 1060 and executing the program module.

The hardware configuration of the computer 1000 is not limited to theconfiguration illustrated in FIG. 4 . For example, each program modulemay be stored in the memory 1060. In this case, the computer 1000 maynot include the storage 1080.

Note that the information processing apparatus 2000 may be implementedusing a plurality of computers. For example, a computer that implementsthe function of the first analyzing unit 2020, a computer thatimplements the function of the second analyzing unit 2040, and acomputer that implements the function of the estimating unit 2060 may bedifferent computers.

All or a part of the functions of the information processing apparatus2000 may be implemented by the fixed camera 10 or the moving camera 20.For example, a camera called an intelligent camera, a network camera, oran Internet protocol (IP) camera can be used as the fixed camera 10 orthe moving camera 20 that has all or a part of the functions of theinformation processing apparatus 2000.

In the case of implementing a part of the function of the informationprocessing apparatus 2000 by the fixed camera 10 or the moving camera20, for example, the function of the first analyzing unit 2020 isimplemented by the fixed camera 10. The function of the second analyzingunit 2040 is implemented by the moving camera 20. The function of theestimating unit 2060 is implemented by a server machine. In this case,the fixed camera 10 calculates the flow of the crowd in the capturingrange of the fixed camera 10 by processing the first surveillance image12 generated by itself. In addition, the moving camera 20 calculates thedistribution of the attribute of the objects in the capturing range ofthe moving camera 20 by processing the second surveillance image 22generated by itself. The server machine acquires information indicatingthe flow of the crowd in the capturing range of the fixed camera 10 fromthe fixed camera 10, and acquires information indicating thedistribution of the attribute of the objects in the capturing range ofthe moving camera 20 from the moving camera 20. The server machineestimates the attribute distribution for a range not included in thecapturing range of the moving camera 20 using the acquired information.

Flow of Process

FIG. 5 is a flowchart illustrating the flow of a process executed by theinformation processing apparatus 2000 of Example Embodiment 1. The firstanalyzing unit 2020 acquires the first surveillance image 12 (S102). Thefirst analyzing unit 2020 calculates the flow of the crowd in thecapturing range of the fixed camera 10 using the first surveillanceimage 12 generated by the fixed camera 10 (S104). The second analyzingunit 2040 acquires the second surveillance image 22 (S106). The secondanalyzing unit 2040 calculates the attribute distribution for thecapturing range of the moving camera 20 using the second surveillanceimage 22 generated by the moving camera 20 (S108). The estimating unit2060 estimates the attribute distribution for the estimation range notincluded in the capturing range of the moving camera 20 based on theattribute distribution in the capturing range of the moving camera 20and the flow of the crowd in the capturing range of the fixed camera 10(S110).

Method of Acquiring First Surveillance Image 12: S102

The first analyzing unit 2020 acquires the first surveillance image 12(S102). The method of acquiring the first surveillance image 12 by thefirst analyzing unit 2020 is not limited. For example, the firstanalyzing unit 2020 receives the first surveillance image 12 that istransmitted from the fixed camera 10. Alternatively, for example, thefirst analyzing unit 2020 accesses the fixed camera 10 and acquires thefirst surveillance image 12 that is stored in the fixed camera 10. Thefixed camera 10 may store the first surveillance image 12 in a storagedevice that is installed outside the fixed camera 10. In this case, thefirst analyzing unit 2020 may access the storage device and acquire thefirst surveillance image 12.

The first analyzing unit 2020 may acquire the first surveillance image12 in real time, or may acquire the first surveillance image 12 after awhile from the generation of the first surveillance image 12. In thelatter case, for example, the information processing apparatus 2000grasps the past attribute distribution in the surveillance location byacquiring the first surveillance image 12 and the second surveillanceimage 22 captured in the past (for example, the previous day), andanalyzes the behavior of the crowd.

In a case where the fixed camera 10 has the function of the firstanalyzing unit 2020, the first analyzing unit 2020 acquires the firstsurveillance image 12 that is stored in a storage device (for example,the memory 1060 or the storage 1080 in FIG. 4 ) inside the fixed camera10.

Method of Acquiring Second Surveillance Image 22: S106

The second analyzing unit 2040 acquires the second surveillance image 22(S106). The method of acquiring the second surveillance image 22 by thesecond analyzing unit 2040 is the same as the method of acquiring thefirst surveillance image 12 by the first analyzing unit 2020.

In a case where the moving camera 20 has the function of the secondanalyzing unit 2040, the second analyzing unit 2040 acquires the secondsurveillance image 22 that is stored in a storage device (for example,the memory 1060 or the storage 1080 in FIG. 4 ) inside the moving camera20.

Method of Calculating Flow of Crowd: S104

The first analyzing unit 2020 calculates the flow of the crowd in thecapturing range of the fixed camera 10 (S104). The first analyzing unit2020 calculates at least the direction of the flow of the crowd. Forexample, the first analyzing unit 2020 calculates a vector (hereinafter,a flow vector) representing the flow of the crowd captured in the firstsurveillance image 12 using one or a plurality of the first surveillanceimages 12. The first analyzing unit 2020 sets the direction indicated bythe vector as the direction of the flow of the crowd.

Furthermore, the first analyzing unit 2020 may calculate the speed ofthe flow of the crowd. In this case, the first analyzing unit 2020calculates a velocity vector representing the velocity of the crowd asthe flow vector. The first analyzing unit 2020 sets the directionindicated by the velocity vector as the direction of the flow of thecrowd, and sets the length of the velocity vector as the speed of theflow of the crowd.

There are various methods of calculating the flow vector of the crowd bythe first analyzing unit 2020. Hereinafter, those methods will beillustrated.

Method 1

The first analyzing unit 2020 calculates the optical flow of a pixel ora feature point included in each of the plurality of first surveillanceimages 12 in time series. FIG. 6 is a diagram illustrating the opticalflow calculated for the first surveillance image 12. Each arrowillustrated in FIG. 6 represents the optical flow calculated for thefirst surveillance image 12.

The first analyzing unit 2020 calculates the flow vector based on thecalculated optical flow. For example, the first analyzing unit 2020selects one of the calculated optical flows and calculates the flowvector based on the selected optical flow. For example, assume that thefirst analyzing unit 2020 randomly selects one optical flow, convertsthe vector on the image into a vector in a real space, and sets thevector in the real space as the flow vector. In this conversion, theflow vector is calculated by converting the coordinates of the point onthe image into the coordinates of the point in the real space (on themap) using camera parameters described later. For example, given thatthe starting point and the ending point of the vector on the image are(xs, ys) and (xe, ye), and the coordinates in the real spacecorresponding to those points are (Xs, Ys) and (Xe, Ye), the flow vectorcan be calculated as (Xe−Xs, Ye−Ys).

Alternatively, for example, the first analyzing unit 2020 may calculateone vector by statistically processing the plurality of calculatedoptical flows, and calculate the flow vector based on this vector. Thisstatistical processing is, for example, a process of calculating theaverage of the vectors. The calculation of the flow vector does not needto be performed once for the entire screen, and may be performed forindividual regions.

Note that a well-known technique can be used as a technique forcalculating the optical flow using the pixel or the feature pointincluded in the image.

Method 2

The first analyzing unit 2020 detects a captured object that is commonin the plurality of first surveillance images 12 in time series, andcalculates the flow vector based on a change in the position of theobject. FIG. 7 is a diagram illustrating a change in the position of theobject. In FIG. 7 , assume that objects represented by a dotted line arecaptured in the t-th first surveillance image 12, and objectsrepresented by a solid line are captured in the (t+1)-th firstsurveillance image 12. Each arrow represents a change in the position ofeach object. The change in the position of each object is, for example,a vector that connects the centroids or ground positions (in the case ofa person, feet) of a plurality of regions representing the same object.

Note that in a case where a plurality of objects are captured in thefirst surveillance image 12, a plurality of vectors representing changesin the positions of the objects are calculated as in the case of usingthe optical flow. Therefore, for example, the first analyzing unit 2020selects one of the plurality of objects, and sets the vectorrepresenting a change in the position of the selected object as the flowvector.

For example, the first analyzing unit 2020 randomly selects one object.Alternatively, for example, the first analyzing unit 2020 may select aneasily traceable object from the objects captured in the firstsurveillance image 12. The easily traceable object is an object thefeature of which, such as color and shape, is significantly differentfrom other objects and the background. For example, assume that mostpeople captured in the first surveillance image 12 wear almost whiteclothes, and the color of the background is similar to white. In thiscase, a person who wears red or black clothes is the easily traceableobject. Therefore, the first analyzing unit 2020 calculates a vectorrepresenting a change in the position of the easily traceable object.This vector is set as the flow vector.

The vector that represents a change in position can be accuratelycalculated for the easily traceable object. Thus, by setting the vectorcalculated for the easily traceable object as the flow vector, the flowvector can be accurately calculated.

Alternatively, for example, the first analyzing unit 2020 may calculateone vector by statistically processing the plurality of vectorsrepresenting changes in the positions of the plurality of objects, andset this vector as the flow vector. This statistical processing is, forexample, a process of calculating the average of the vectors. At thispoint, a weighted mean may be calculated by assigning a large weight tothe vector calculated for the easily traceable object.

As described above, the vector that represents a change in position canbe accurately calculated for the easily traceable object. Thus, byassigning a large weight to this vector, the flow vector can beaccurately calculated.

Method 3

In a case where it is desirable to find the moving direction of thecrowd, the first analyzing unit 2020 may calculate the direction of theflow vector based on the direction of each object captured in the firstsurveillance image 12. For example, in a case where each object is aperson or an animal, the first analyzing unit 2020 determines thedirection of the face or the body of each object, and sets the directionin which the front of the face or the body faces as the flow vector. Ina case where each object is a thing such as a vehicle, a motorcycle, ora flying object, the first analyzing unit 2020 determines the travelingdirection of each object from the shape, the position of variouscomponents (a bumper, a handle, and the like), and the like of theobject captured in the first surveillance image 12, and sets thedetermined traveling direction as the direction of the flow vector.

The method of calculating the direction or speed of the flow of thecrowd is not limited to the above methods. A well-known technique thatuses one or more images to calculate the direction or the speed of theflow of the objects (for example, the flow of people (stream of people))captured in the images can be used as the method of calculating thedirection and the speed.

Attribute of Object

There are various attributes of an object handled by the informationprocessing apparatus 2000. For example, in a case where the object is aperson, the attribute is an age bracket, a sex, nationality, a groupthat the person belongs to, the presence of belongings, whether or notthe person is a person having difficulty in walking, or the like. Theperson having difficulty in walking means a person who has a lowerwalking velocity than a general person due to a wound, a disability, andthe like. The object may have various attribute values for eachattribute. The attribute value is a value of the object for a certainattribute.

The attribute value of the age bracket has various values representingthe age bracket. For example, the attribute value of the age bracket isan approximate age (10s or 20s) or a stage representing age (a child, ayouth, a senior person, or the like). The attribute value of sex is maleor female.

The attribute value of nationality is a value that represents the nationwhere the person was born, the nation where the person is living, or thefeature of the person based on the nation of the person. For example,the attribute value of nationality indicates a Japanese person or aforeigner. In addition, for example, the attribute value of nationalityindicates distinction of nations in Asia, Europe, America, or the like.In addition, for example, the attribute value of nationality mayindicate a used language (Japanese, English, Chinese, or the like).

The attribute value of the group to which the person belongs mayindicate any group. For example, in a case where the location undersurveillance using the information processing apparatus 2000 is apassageway through which an audience passes, or a seat for the audiencein a stadium, the person is categorized depending on a team for whichthe person is a supporter. More specifically, in a case where a team Aand a team B are having a match in the stadium, the attribute value ofthe person may indicate a “supporter of the team A” or a “supporter ofthe team B”.

The attribute value of the presence of belongings indicates, for variouspossessions, whether or not the person is carrying belongings, orwhether or not the person is using belongings. For example, thepossession corresponds to a cane, a wheelchair, a stroller, or the like.For example, the attribute value of the presence of a cane representswhether or not the person has a cane, or whether or not the person isusing a cane.

The attribute value of whether or not the person is a person havingdifficulty in walking represents whether or not the walking velocity ofthe person is lower than a general velocity. For example, whether or notthe person is a person having difficulty in walking can be determined bythe presence of a cane, or the presence of a wheelchair. Specifically,it can be estimated that a person who is using a cane or a wheelchair isa person having difficulty in walking, and a person who is not using acane or a wheelchair is not a person having difficulty in walking.Alternatively, for example, whether or not the person is a person havingdifficulty in walking can be determined by the age bracket.Specifically, it can be estimated that a senior person is a personhaving difficulty in walking, and a person other than a senior person isnot a person having difficulty in walking. Alternatively, whether or notthe person is a person having difficulty in walking may be determined bydirectly analyzing the way of walking of the person using a gaitanalysis technique. For example, whether or not the person is a personhaving difficulty in walking may be determined using categoriesincluding a way of walking using a cane, a way of walking of a blindperson (a way of walking with a white cane, a way of walking with aguide dog, and the like), a way of walking of a deaf person with ahearing dog, and a general way of walking.

Method of Calculating Attribute Distribution: S106

The estimating unit 2060 calculates the attribute distribution in thecapturing range of the moving camera 20 (S106). First, the estimatingunit 2060 calculates the attribute value for all objects or a part ofthe objects captured in the second surveillance image 22. For example,in a case where sex is handled as an attribute, the second analyzingunit 2040 determines whether each object is a male or a female. Thesecond analyzing unit 2040 calculates the attribute distribution basedon the calculated attribute value of each object.

Method of Calculating Attribute Value

The method of calculating the attribute value of each object by thesecond analyzing unit 2040 varies depending on the handled attribute.For example, the second analyzing unit 2040 calculates the age bracket,the sex, or the nationality of a person from the feature and the like ofthe face of the person captured in the second surveillance image 22. Awell-known technique can be used as a technique for calculating the agebracket, the sex, or the nationality (ethnic group) from the feature andthe like of the face of the person.

In a case where the attribute is the group to which the person belongs,the second analyzing unit 2040 determines the group to which each objectbelongs based on the exterior, belongings, and the like of the object.For example, a team for which a certain person is a supporter can bedetermined based on the clothes, a cheering item, and the like possessedby the person captured in the second surveillance image 22. A well-knownobject recognition technique can be used as a technique for determiningwhether or not a specific thing is captured in the image. For example, atechnique for determining whether or not the clothes of the person arethe same as a uniform of a team that the person cheers for by analyzingthe color and shape of the clothes, or a technique for determiningwhether or not the same object is included in the image by extracting afeature point and comparing the feature point with the feature point ofa registered specific object can be applied.

In a case where the attribute is the presence of belongings, the secondanalyzing unit 2040 determines the attribute value of the person bycalculating whether or not the person captured in the secondsurveillance image 22 possesses a cane, a wheelchair, a stroller, andthe like. As described above, a well-known object recognition techniquecan be used as a technique for determining whether or not a specificthing is captured in the image. For example, objects such as awheelchair, a cane, and a stroller may be detected using a discriminatorthat learns the features of a wheelchair, a cane, and a stroller inadvance.

Similarly, in a case where the attribute is whether or not the person isa person having difficulty in walking, the second analyzing unit 2040calculates the attribute value of the person by determining whether ornot the person captured in the second surveillance image 22 possesses acane or a wheelchair. Specifically, the second analyzing unit 2040 setsthe attribute value of the person to “person having difficulty inwalking” when the person captured in the second surveillance image 22possesses a cane or a wheelchair. The second analyzing unit 2040 setsthe attribute value of the person to “not a person having difficulty inwalking” when the person does not possess a cane or a wheelchair.Alternatively, the second analyzing unit 2040 may determine theattribute value by determining whether or not the age bracket of theperson captured in the second surveillance image 22 indicates a seniorperson. Specifically, the second analyzing unit 2040 sets the attributevalue of the person to “person having difficulty in walking” when theage bracket of the person captured in the second surveillance image 22indicates a senior person. The second analyzing unit 2040 sets theattribute value of the person to “not a person having difficulty inwalking” when the age bracket of the person indicates other than asenior person. Alternatively, the second analyzing unit 2040 maycalculate the attribute value by analyzing the way of walking of theperson captured in the second surveillance image 22 and determining thedegree of difference from the way of walking of a general person.Specifically, the second analyzing unit 2040 sets the attribute value ofthe person to “person having difficulty in walking” in a case where thedegree of difference from the way of walking of a general person issignificant. Otherwise, the second analyzing unit 2040 sets theattribute value of the person to “not a person having difficulty inwalking”. Alternatively, the second analyzing unit 2040 may decide theattribute value of the person by determining whether or not the way ofwalking of the person is a way of walking that is specific to a casewhere the person possesses a wheelchair or a cane, directly using adiscriminator that learns the way of walking (way of moving forward) ina case where the person possesses a wheelchair or a cane.

Note that the attribute value may be calculated without the secondsurveillance image 22. For example, in a case where a microphone isinstalled around the capturing range of the moving camera 20, the secondanalyzing unit 2040 may calculate the attribute value of each object inthe capturing range of the moving camera 20 by analyzing a voice that isrecorded using the microphone. For example, in a case where the movingcamera 20 generates a video including a voice, the second analyzing unit2040 can acquire a voice around the capturing range of the moving camera20 by acquiring the voice included in the video.

For example, the second analyzing unit 2040 determines the attributevalue of the age bracket or the sex from the tone and the like of therecorded voice. In addition, for example, the second analyzing unit 2040determines the attribute value of nationality by determining the usedlanguage from the recorded voice.

In addition, for example, the second analyzing unit 2040 determines theattribute value of the group to which the person belongs, from wordsincluded in the recorded voice. For example, it is considered that avoice uttered by a supporter of a certain team includes many words suchas the names of players of the team. Therefore, dictionary dataincluding keywords for the supporter of the team, such as the names ofplayers belonging to that team, is prepared for each team. The secondanalyzing unit 2040 determines the attribute value of the group to whichthe person belongs by matching the word included in the recorded voiceagainst the dictionary data.

In a case where the used language varies depending on the group to whichthe person belongs, the second analyzing unit 2040 may determine theused language from the recorded voice and determine the group to whichthe person belongs using the used language. For example, in a sportsmatch venue where a match between Japan and America is taking place, itcan be estimated that a person who speaks Japanese is a supporter of theJapanese team, and a person who speaks English is a supporter of theAmerican team.

Note that there may be different dialects and pronunciations in the samelanguage depending on the nation. For example, American English, BritishEnglish, New Zealand English, and the like have different dialects andpronunciations. In addition, for example, there may be differentdialects and pronunciations in the language of the same nation. Forexample, in Japanese, dialects and pronunciations vary depending on theregions such as Tokyo, Kansai, and Tohoku. Therefore, the secondanalyzing unit 2040 may determine the attribute value of nationality orthe group to which the person belongs by determining such a differencein dialect and pronunciation.

In addition, the second analyzing unit 2040 may calculate the number ofspeakers (the number of objects) from the recorded voice using a speakeridentification technique and the like, and reflect the number ofspeakers in the distribution.

Method of Calculating Attribute Distribution

The second analyzing unit 2040 calculates the attribute distribution inthe capturing range of the moving camera 20 based on the calculatedattribute value of each object. There are various methods of calculatingthe attribute distribution by the second analyzing unit 2040. Forexample, the second analyzing unit 2040 sets the number of objectshaving each attribute value (a collection including a pair of anattribute value and the number of objects having the attribute value) asthe attribute distribution.

For example, in the case of handling sex as the attribute, assume thatthe second analyzing unit 2040 calculates the attribute value as malefor 10 persons captured in the second surveillance image 22, andcalculates the attribute value as female for 15 persons captured in thesecond surveillance image 22. In this case, the attribute distributionof sex in the capturing range of the moving camera 20 is “10 males and15 females”.

Alternatively, the attribute distribution may indicate the number ofobjects for only a certain attribute value. For example, in a case wherethe second analyzing unit 2040 calculates the attribute value as malefor 10 persons captured in the second surveillance image 22, theattribute distribution of objects the sex of which is male is “15” inthe capturing range of the moving camera 20.

Alternatively, the second analyzing unit 2040 may calculate theattribute distribution of a certain attribute as the ratio of theattribute value (the ratio of the number of objects having eachattribute value). For example, as in the above example, assume that 10males and 15 females are captured in the second surveillance image 22.In this case, the second analyzing unit 2040 calculates the attributedistribution of sex as “male:female=2:3”.

In a case where the attribute value is calculated for a part of objectscaptured in the second surveillance image 22, the second analyzing unit2040 calculates the attribute distribution for the part of objects forwhich the attribute value is calculated, and based on that attributedistribution, calculates the attribute distribution in the capturingrange of the moving camera 20. That is, regarding objects the attributesvalue of which is not calculated, the attribute value thereof isestimated.

In this case, first, for the objects for which the attribute value iscalculated, the second analyzing unit 2040 calculates the attributedistribution that is represented by the ratio of objects having eachattribute value. It is highly likely that the ratio of the attributevalue in the whole capturing range of the moving camera 20 is close tothe ratio of the attribute value that is calculated for the part ofobjects included in the capturing range of the moving camera 20. Forexample, in a case where the ratio of “male: female=2:3” is calculatedfor the part of objects included in the moving camera 20, it is highlylikely that the attribute is distributed at the same ratio for the wholecapturing range of the moving camera 20.

Therefore, the second analyzing unit 2040 sets the ratio of theattribute value calculated for the part of objects included in themoving camera 20 as the attribute distribution in the whole capturingrange of the moving camera 20.

The second analyzing unit 2040 may generate the attribute distributionusing a single second surveillance image 22, or may generate theattribute distribution using a plurality of the second surveillanceimages 22. In the latter case, for example, the second analyzing unit2040 calculates the attribute distribution for each second surveillanceimage 22. The second analyzing unit 2040 generates the conclusiveattribute distribution by statistically processing the attributedistribution calculated for each second surveillance image 22.

For example, assume that the second analyzing unit 2040 generates theattribute distribution using two second surveillance images 22. In thiscase, assume that the attribute distribution is calculated as “10 malesand 20 females” for the first of the second surveillance images 22, andthe attribute distribution is calculated as “12 males and 24 females”for the second of the second surveillance images 22. In this case, thesecond analyzing unit 2040 generates the attribute distribution as “11males and 22 females” or “male:female=1:2” using the two secondsurveillance images 22.

Method of Estimating Attribute Distribution: S108

The estimating unit 2060 estimates the attribute distribution for theestimation range that is a range outside the capturing range of themoving camera 20 (S108). To do so, the estimating unit 2060 uses theflow of the crowd in the capturing range of the fixed camera 10, and theattribute distribution in the capturing range of the moving camera 20.Hereinafter, a concrete method of estimating the attribute distributionby the estimating unit 2060 will be illustrated.

The estimating unit 2060 calculates the attribute distribution in theestimation range using the velocity (hereinafter, a moving velocity) ofthe flow of the crowd in the capturing range of the fixed camera 10.First, the estimating unit 2060 estimates the moving velocity of thecrowd in the capturing range of the moving camera 20 based on the movingvelocity of the crowd in the capturing range of the fixed camera 10. Theestimating unit 2060 estimates the attribute distribution in theestimation range by moving the attribute distribution in the capturingrange of the moving camera 20 at the estimated velocity.

Case Where Capturing Range of Fixed Camera 10 Overlaps Capturing Rangeof Moving Camera 20

In a case where the capturing range of the fixed camera 10 overlaps thecapturing range of the moving camera 20, the estimating unit 2060estimates the moving velocity of the crowd in the capturing range of themoving camera 20 to be the same velocity as the moving velocity of thecrowd in the capturing range of the fixed camera 10. For example, in acase where the moving velocity of the crowd in the capturing range ofthe fixed camera 10 is “10 m/sec in the rightward direction”, the movingvelocity of the crowd in the capturing range of the moving camera 20 isestimated to be “10 m/sec in the rightward direction”. Therefore, theestimating unit 2060 sets the estimation range to be a position that ismoved by 10*n [m] in the rightward direction from the capturing range ofthe moving camera 20 n seconds (n is a positive real number) after timet, and estimates the attribute distribution in the estimation range tobe the same attribute distribution as the attribute distribution in thecapturing range of the moving camera 20 at time t.

FIGS. 8A and 8B and FIGS. 9A and 9B are diagrams illustrating a scene inwhich the attribute distribution in the estimation range is estimated bymoving the attribute distribution in the capturing range of the movingcamera 20. In this example, the information processing apparatus 2000repeats the calculation of the velocity of the crowd in the capturingrange 14 of the fixed camera 10, the calculation of the attributedistribution in the capturing range 24 of the moving camera 20, and theestimation of the attribute distribution in the estimation range, eachfor one second. In this case, the first analyzing unit 2020 or thesecond analyzing unit 2040 calculates the velocity of the crowd and theattribute distribution at a certain time using the first surveillanceimage 12 or the second surveillance image 22 that is generated in onesecond immediately before the time.

At certain time t, the moving velocity of the crowd in the capturingrange 14 of the fixed camera 10 is “10 m/sec in the rightwarddirection”, and the attribute distribution in the capturing range 24 ofthe moving camera 20 is “male:female=1:2” (refer to FIG. 8A). Therefore,the estimating unit 2060 estimates the attribute distribution at timet+1 to be “male:female=1:2” for an estimation range 60-1 that is at aposition moved by 10 m in the rightward direction from the capturingrange 24 of the moving camera 20 (refer to FIG. 8B).

At time t+1, the moving velocity of the crowd in the capturing range 14of the fixed camera 10 is “8 m/sec in the rightward direction”, and theattribute distribution in the capturing range 24 of the moving camera 20is “male:female=2:3” (see FIG. 8B). Therefore, the estimating unit 2060estimates the attribute distribution at time t+2 to be “male:female=2:3”for an estimation range 60-2 that is at a position moved by 8 m in therightward direction from the capturing range 24 of the moving camera 20(see FIG. 9A). In addition, the estimation range 60-1 is further movedby 10 m in the rightward direction by time t+2.

At time t+2, the velocity of the crowd in the capturing range 14 of thefixed camera 10 is “9 m/sec in an upper rightward direction”, and theattribute distribution in the capturing range 24 of the moving camera 20is “male:female=3:4” (see FIG. 9A). Therefore, the estimating unit 2060estimates the attribute distribution at time t+3 to be “male:female=3:4”for an estimation range 60-3 that is at a position moved by 9 m in theupper rightward direction from the capturing range 24 of the movingcamera 20 (see FIG. 9B). In addition, the estimation range 60-2 isfurther moved by 8 m in the rightward direction by time t+3. Note thatwhile illustration is not provided in the drawings, the estimation range60-1 is further moved by 10 m in the rightward direction by time t+3.

By such repeated processing of the information processing apparatus2000, the attribute distribution can be estimated for a wide range thatis not included in the capturing range of the moving camera 20.

Case Where Capturing Range of Fixed Camera 10 Does Not Overlap CapturingRange of Moving Camera 20

In a case where the capturing ranges of the fixed camera 10 and themoving camera 20 do not overlap each other, the estimating unit 2060estimates the moving velocity of the crowd in the capturing range of themoving camera 20 from the moving velocity of the crowd in the fixedcamera 10. Various specific methods may be used.

For example, the estimating unit 2060 estimates the moving velocity ofthe crowd in the capturing range of the moving camera 20 to be the sameas the moving velocity of the crowd in the capturing range of the fixedcamera 10. Particularly, for example, in a case where the capturingranges of the fixed camera 10 and the moving camera 20 are positionedclose to each other, or in a case where the flow of the crowd is uniformin the location of the surveillance target, it is highly likely that themoving velocity of the crowd in the capturing range of the fixed camera10 is similar to that in the capturing range of the moving camera 20.

In addition, for example, the estimating unit 2060 estimates the movingvelocity of the crowd in the capturing range of the moving camera 20from the moving velocity of the crowd in the fixed camera 10 using mapinformation around where the fixed camera 10 or the moving camera 20 ispositioned. The map information is any information that represents aconfiguration of roads and the like. Generally, crowds move along roads.Thus, in a case where a road is curved, or in a case where a road has acorner, the moving direction of the crowd in the capturing range of themoving camera 20 may be different from the moving direction of the crowdin the capturing range of the fixed camera 10. Even in such a case, themoving direction of the crowd in the capturing range of the movingcamera 20 can be estimated by recognizing the configuration of roadsusing the map information.

FIGS. 10A and 10B are diagrams illustrating a scene in which the movingdirection of the moving camera 20 is estimated using the mapinformation. In FIG. 10A, the moving direction of the crowd in acapturing range 14-1 of the fixed camera 10 is a direction 50-1. Theestimating unit 2060 estimates the crowd included in the capturing range14-1 to reach a capturing range 24-1 of the moving camera 20 along aroad 40 using the map information. Therefore, the estimating unit 2060estimates the moving direction of the crowd in the capturing range 24-1of the moving camera 20 to be a direction 50-2 to which the direction50-1 is moved along the road 40.

In FIG. 10B, the moving direction of the crowd in a capturing range 14-2of the fixed camera 10 is a direction 50-3. The estimating unit 2060estimates the crowd in the capturing range 14-2 of the fixed camera 10to be the crowd in a capturing range 24-2 of the moving camera 20 thatis moved along the road 40, using the map information. Therefore, theestimating unit 2060 estimates the moving direction of the crowd in thecapturing range 24-2 of the moving camera 20 to be a direction 50-4 towhich the direction 50-3 is moved along the road 40.

Note that in the case of using the map information, there are variousmethods of estimating the speed of the flow of the crowd in thecapturing range of the moving camera 20. For example, the estimatingunit 2060 estimates the speed of the flow of the crowd in the capturingrange of the moving camera 20 to be the same as the speed of the flow ofthe crowd in the capturing range of the fixed camera 10.

Alternatively, for example, the estimating unit 2060 may estimate thespeed of the flow of the crowd in the capturing range of the movingcamera 20 based on a difference between the road around the capturingrange of the fixed camera 10 and the road around the capturing range ofthe moving camera 20. For example, in a case where the width of the roadaround the capturing range of the moving camera 20 is larger than thewidth of the road around the capturing range of the fixed camera 10, theestimating unit 2060 estimates the speed of the flow of the crowd in thecapturing range of the moving camera 20 to be lower than the speed ofthe flow of the crowd in the capturing range of the fixed camera 10. Onthe other hand, in a case where the width of the road around thecapturing range of the moving camera 20 is smaller than the width of theroad around the capturing range of the fixed camera 10, the estimatingunit 2060 estimates the speed of the flow of the crowd in the capturingrange of the moving camera 20 to be higher than the speed of the flow ofthe crowd in the capturing range of the fixed camera 10. However, whenthe density of the crowd becomes equal to a certain level or higher, therange of movement of a person is restricted, and the velocity of thecrowd is decreased. Thus, considering the density of the crowd as well,the velocity of the crowd may be estimated to be decreased when thedensity of the crowd becomes equal to a certain level or higher.

A well-known technique can be used for generating the map informationused by the estimating unit 2060. For example, the map information ismap information that is used in a navigation application and the like.The method of acquiring the map information by the estimating unit 2060is not limited. For example, the map information is stored in a storagethat can be accessed from the estimating unit 2060.

Assume that the first analyzing unit 2020 calculates only the directionof the flow of the crowd and do not calculate the speed of the flow ofthe crowd. In this case, for example, the estimating unit 2060 handles apredetermined speed that is set in advance as the speed of the flow ofthe crowd in the capturing range of the fixed camera 10. Thepredetermined speed may be a value that is manually set, or may be avalue that is calculated from a surveillance result in the past.Alternatively, the speed of the flow of the crowd that is estimated bysimulating the movement of the crowd instead of the surveillance resultmay be used as the predetermined speed. That is, a change in themovement of the crowd is calculated by simulation using the mapinformation. Various well-known crowd simulation technologies can beused.

In the case of repeatedly surveilling a certain location, the speed ofthe flow of the crowd passing through the location may be estimated fromthe surveillance result in the past. Therefore, for example, a statisticvalue of the speed of the flow of the crowd that is repeatedlycalculated in the past for the capturing range of the fixed camera 10 isset as the predetermined speed. This calculation may be manuallyperformed, or may be performed using any computer.

The speed of the flow of the crowd may vary depending on time periods.For example, the speed of the flow of the crowd may be high during acommute time period, and the speed of the flow of the crowd may be lowduring other time periods. Therefore, the predetermined speed may be setfor each time period. In this case, the estimating unit 2060 uses thepredetermined speed that is set for a time period matching a time periodin which the first surveillance image 12 is generated.

Information that indicates the predetermined speed may be set in advancein the estimating unit 2060, stored in the storage device that can beaccessed from the estimating unit 2060, or set by a user of theinformation processing apparatus 2000.

Estimation of Moving Velocity of Crowd

The method of estimating the moving velocity of the crowd included inthe capturing range of the moving camera 20 is not limited to the abovemethod of estimating the moving velocity of the crowd included in thecapturing range of the fixed camera 10 to be the moving velocityincluded in the capturing range of the moving camera 20. For example,the estimating unit 2060 may directly calculate the moving velocity ofthe crowd included in the capturing range of the moving camera 20 usingthe second surveillance image 22. In this case, the estimating unit 2060calculates the moving velocity of the crowd captured in the secondsurveillance image 22. Note that the method of calculating the movingvelocity of the crowd captured in the second surveillance image 22 isthe same as the method of calculating the moving velocity of the crowdcaptured in the first surveillance image 12.

However, since the moving camera 20 moves unlike the fixed camera 10,not only the objects but also the background move in the secondsurveillance image 22. Thus, in the case of calculating the movingvelocity of the crowd captured in the second surveillance image 22, themotion of the crowd needs to be calculated after the motion of thebackground among a plurality of frames (second surveillance images 22)is compensated.

For example, the motion of the background can be acquired by matchingfeature points extracted from the background among the frames.Similarly, the motion of the foreground can also be acquired by matchingfeature points among the frames.

Therefore, first, the estimating unit 2060 acquires the amount ofmovement of each of the foreground and the background on the secondsurveillance image 22. Next, the estimating unit 2060 calculates theamount of movement of only the foreground (only the objects) bysubtracting the amount of movement of the background from the amount ofmovement of the foreground. The estimating unit 2060 calculates themoving velocity from this amount of movement and its moving direction.

Alternatively, the estimating unit 2060 may calculate the movingvelocity of the crowd included in the capturing range of the movingcamera 20 using both the moving velocity of the crowd calculated usingthe first surveillance image 12 and the moving velocity of the crowdcalculated using the second surveillance image 22. For example, theestimating unit 2060 sets the moving velocity of the crowd included inthe capturing range of the moving camera 20 to be a velocity that isacquired by statistically processing (for example, averaging) the movingvelocity of the crowd calculated using the first surveillance image 12and the moving velocity of the crowd calculated using the secondsurveillance image 22. Note that at this point, a weighted mean may becalculated by assigning a large weight to the moving velocity of thecrowd calculated using the second surveillance image 22.

Estimation Range 60

In the example in FIGS. 9A and 9B and FIGS. 10A and 10B, the estimationrange 60 is a range that has the same shape and area as the capturingrange of the moving camera 20. However, the estimation range 60 is notlimited to such a range. Hereinafter, various estimation ranges 60 willbe illustrated.

Estimation Range 60 Having Predetermined Shape and Size

The estimating unit 2060 sets the estimation range 60 to be a range thathas a predetermined shape and area set in advance. The predeterminedshape and area may be set in advance in the estimating unit 2060, storedin the storage device that can be accessed from the estimating unit2060, or set by the user.

FIGS. 11A and 11B are diagrams illustrating a scene in which theattribute distribution is estimated for the estimation range 60 havingthe predetermined shape and area. Specifically, the estimation range 60is a square range that has an area of 10 m2. Note that the position ofthe estimation range 60 is calculated in the same manner as FIGS. 8A and8B based on the moving velocity estimated for the crowd included in thecapturing range of the moving camera 20.

The attribute distribution estimated in FIG. 11A represents the ratio ofthe attribute value (male:female=1:2). The estimating unit 2060 sets theattribute distribution in the estimation range 60 to be a distributionof “male:female=1:2” which is the same as the attribute distribution inthe capturing range of the moving camera 20.

The attribute distribution estimated in FIG. 11B represents the numberof objects having each attribute value. Since the area of the estimationrange 60 is different from the area of the capturing range of the movingcamera 20, it is considered that the number of objects included in theestimation range 60 is different from the number of objects included inthe capturing range of the moving camera 20.

Therefore, first, the estimating unit 2060 calculates the number ofobjects included in the estimation range 60 based on crowd density inthe capturing range of the moving camera 20. The crowd density means thenumber of objects per unit area. The estimating unit 2060 estimates thecrowd density in the estimation range 60 to be the same as the crowddensity in the capturing range of the moving camera 20. Thus, theestimating unit 2060 calculates the number of objects included in theestimation range 60 by multiplying the crowd density in the estimationrange 60 by the area of the estimation range 60.

For example, in FIG. 11B, the crowd density in the capturing range ofthe moving camera 20 is 3 people/m². Therefore, the estimating unit 2060estimates the crowd density in the estimation range 60 to be 3people/m². The estimating unit 2060 multiplies this crowd density and 10m² which is the area of the estimation range 60. Consequently, a valueof 30 is calculated as the number of objects included in the estimationrange 60.

Furthermore, the estimating unit 2060 calculates the number of objectshaving each attribute value based on the number of objects included inthe estimation range 60 and the ratio of the attribute value in theestimation range 60. The estimating unit 2060 estimates the ratio of theattribute value in the estimation range 60 to be the same as the ratioof the attribute value in the capturing range of the moving camera 20.Therefore, the estimating unit 2060 calculates the number of objectshaving each attribute value by multiplying the number of objectsincluded in the estimation range 60 by the ratio of each attributevalue.

For example, in FIG. 11B, the ratio of males to females included in thecapturing range of the moving camera 20 is “male:female=1:2”. Therefore,the estimating unit 2060 estimates the ratio of males to femalesincluded in the estimation range 60 to be “male:female=1:2”. From thisratio and the fact that the number of objects included in the estimationrange 60 is 30, the estimating unit 2060 sets the attribute distributionin the estimation range 60 to be “10 males and 20 females”.

The crowd density in the capturing range of the moving camera 20 iscalculated by the second analyzing unit 2040. The second analyzing unit2040 calculates the crowd density based on the number of objectscaptured in the second surveillance image 22 and the area of thecapturing range of the moving camera 20.

Note that in FIG. 11B, the estimating unit 2060 may use the crowddensity in the capturing range of the fixed camera 10 instead of thecrowd density in the capturing range of the moving camera 20. Since thefixed camera 10 which is a surveillance camera or the like generallycaptures the objects in a bird's-eye view, the crowd density in thecapturing range of the fixed camera 10 is calculated with higheraccuracy than the crowd density in the capturing range of the movingcamera 20. Therefore, it is preferable that the estimating unit 2060estimates the crowd density in the estimation range 60 to be the same asthe crowd density in the capturing range of the fixed camera 10.

Estimation Range 60 Having Same Shape and Area as Capturing Range ofFixed Camera 10

The estimating unit 2060 sets the estimation range 60 to be a range thathas the same shape and area as the capturing range of the fixed camera10. FIGS. 12A and 12B are diagrams illustrating a scene in which theattribute distribution is estimated for the estimation range 60 havingthe same shape and area as the capturing range of the fixed camera 10.

The attribute distribution estimated in FIG. 12A represents the ratio ofthe attribute value (male:female=1:2). The estimating unit 2060 sets theattribute distribution in the estimation range 60 to be a distributionof “male:female=1:2” which is the same as the attribute distribution inthe capturing range of the moving camera 20.

The attribute distribution estimated in FIG. 12B represents the numberof objects having each attribute value. The number of objects includedin the crowd in the capturing range 14 of the fixed camera 10 isdifferent from that in the crowd in the capturing range 24 of the movingcamera 20.

In this case, the first analyzing unit 2020 calculates the total numberof objects included in the capturing range 14. Assume that 60 people areincluded in the capturing range 14. Furthermore, the second analyzingunit 2040 calculates the attribute distribution for the crowd in thecapturing range of the moving camera 20. Assume that the attributedistribution is calculated as “10 males and 20 females”.

The estimating unit 2060 estimates the attribute distribution in theestimation range 60 using the ratio of the total number of objectsincluded in the capturing range 14 to the total number of objectsincluded in the capturing range 24, and the attribute distributioncalculated for the capturing range 24. The total number of objectsincluded in the capturing range 14 is twice the total number of objectsincluded in the capturing range 24. Therefore, the estimating unit 2060estimates the attribute distribution in the estimation range 60 to be“20 males (10×2) and 40 females (20×2)”.

Note that the estimating unit 2060 may use the ratio of the crowddensity in the capturing range 14 to the crowd density in the capturingrange 24 instead of the ratio of the total number of objects included inthe capturing range 14 to the total number of objects included in thecapturing range 24. The reason is that those ratios have the same value.

Estimation Range 60 Having Infinite Area

The estimating unit 2060 sets the estimation range to be a range thathas an infinite area. In this case, for example, the estimating unit2060 estimates the attribute distribution in the estimation range byassuming the crowd to be spreading as time elapses, based on adistribution such as a Gaussian distribution.

FIG. 13 is a diagram illustrating a scene in which the crowd spreads astime elapses. In FIG. 13 , a location in darker color represents highercrowd density. A crowd 30 is moving in the rightward direction. Thecrowd is spreading as the crowd moves in the rightward direction, thatis, as time elapses. Note that a graph below the crowd 30 is a graphthat represents a relationship between a position and crowd density.Note that while an isotropic distribution is illustrated, anon-isotropic distribution may also be used. For example, in a casewhere the crowd is walking along a narrow passageway, the distributionis likely to spread in the direction of the passageway and unlikely tospread in a direction perpendicular to the passageway. Thus, adistribution having a high degree of spread in the direction of thepassageway may be used.

Hereinafter, a specific method of estimating the attribute distributionfor a specified range having an infinite area will be illustrated.

The number of objects (hereinafter, objects a) that have a as anattribute value of an attribute A and are present at a position x attime t is represented by ha(x, t). Note that x is a vector andrepresents two-dimensional coordinates. Assume that ha(x, t) representsthe number of objects that are centered at x and are in a range havingthe same area as the capturing range of the fixed camera 10.

The position of the crowd included in the capturing range of the movingcamera 20 at time t0 is represented by x0(t0). Then, the number ofobjects that are included in the capturing range of the moving camera 20at time t0 and have a as the attribute A can be represented byha(x0(t0), t0).

Assume that at time t0, the second analyzing unit 2040 calculates thenumber of objects a to be La among L objects in the capturing range ofthe moving camera 20. In addition, assume that at time t0, the firstanalyzing unit 2020 calculates the number of objects included in thecrowd at the position x0(t0) in the capturing range of the fixed camera10 to be M In this case, it can be estimated that Expression (1) isestablished. Assume that the capturing range of the moving camera 20 isin the capturing range of the fixed camera 10.

$\begin{matrix}{{h_{a}( {{x_{0}( t_{0} )},t_{0}} )} = {L_{a}*\frac{M}{L}}} & (1)\end{matrix}$

The moving velocity of the crowd at the position x0(t0) in the capturingrange of the fixed camera 10 at time t0 is represented by v(x0(t0), t0).In addition, a time interval between each estimation of the attributedistribution by the estimating unit 2060 is represented by Δt. Then, aposition xn(tn) of the crowd at time tn=t0+nΔt can be represented byExpression (2).

x _(n)(t _(n))=x _(n−1)(t _(n−1))+v(x _(n−1)(t _(n−1)),t _(n−1))Δt   (2)

Note that when the moving velocity of the crowd is assumed to be notchanged, Expression (2) can be modified as follows.

x _(n)(t _(n))=x ₀(t ₀)+v(x ₀(t ₀),t ₀)(n−1)Δt   (3)

In this example, assume that the objects at the position x disperse inaccordance with a function p(x, τ). A value representing time issubstituted for τ. For example, a distribution the variance of which isincreased in accordance with an increase in τ (along with elapse oftime) as illustrated in FIG. 13 is used in the function p. For example,a Gaussian distribution is used as such a distribution.

When the function p is used, the number ha(xn, tn) of objects having aas the attribute A at the position xn at time tn=t+nΔt can berepresented by Expression (4).

h _(a)(x _(n) ,t _(n))=h _(a)(x ₀(t ₀),t ₀)p(x−x _(n)(t _(n)),nΔt)   (4)

The number of objects a at any position is found by inputting any valuein x of Expression (3). Thus, according to Expression (3), the attributedistribution of the objects is theoretically estimated for the specifiedrange having an infinite area.

Note that the attribute distribution (the number of objects having a asthe attribute A) estimated by the information processing apparatus 2000is not the attribute distribution based on the attribute valuecalculated by the second analyzing unit 2040 at time t0, but it is asuperposition of the attribute distribution based on the attribute valuecalculated by the second analyzing unit 2040 at each time. Thus, theattribute distribution estimated by the information processing apparatus2000 is represented by Expression (5). In Expression (5), the attributedistribution in an infinite range at time tn is estimated using theattribute distributions calculated at time t0 to tn.

$\begin{matrix}{{H_{a}( {x,t_{n}} )} = {\sum\limits_{k = 0}^{n}{{h_{a}( {{x_{0}( t_{k} )},t_{k}} )}{p( {{x - {x_{n - k}( t_{n} )}},{( {n - k} )\Delta t}} )}}}} & (5)\end{matrix}$

Note that while all of ha from k=0 to n is added together in Expression(5), for each x, the value of k for which a value exists is limited in acase where p(x, τ) has a value only in a finite support. Thus, all of hadoes not need to be added together, and ha may be added together foreach position of x for only k for which the function p has a value.Alternatively, even in the case of a function the support of which isnot finite like a Gaussian function, a sufficiently small value of thefunction may be regarded as zero, and ha may be added together in aregion where the function has a value not equal to zero.

Assume that the attribute distribution that is represented by the numberof objects having each attribute value (“15 males and 10 females” andthe like) or by the ratio of the attribute value (“male:female=3:2” andthe like) is desired to be calculated using Ha. This attributedistribution is a distribution that is acquired for a certain finiterange. Therefore, in a case where such an attribute distribution isdesired to be calculated, Ha(xi, tn) is calculated for each attributevalue for a range of the position xi in which the distribution isdesired to be grasped. For example, in a case where the attribute valueof the attribute A is a or b, Ha(xi, tn) and Hb(xi, tn) are calculated.By using Ha(xi, tn) and Hb(xi, tn), an attribute distribution“N(a)=Ha(xi, tn), N(b)=Hb(xi, n)” that is represented by the number ofobjects having each attribute value, or an attribute distribution“a:b=Ha(xi, tn):Hb(xi, tn)” that is represented by the ratio of eachattribute value can be calculated. Note that N(a) means the number ofobjects having a as the attribute value.

Case Where Plurality of Flows of Crowds are Present in Fixed Camera 10

A plurality of flows of crowds may be present in the capturing range ofthe fixed camera 10. FIGS. 14A and 14B are diagrams illustrating a scenein which a plurality of flows of crowds are present. In FIGS. 14A and14B, a crowd moving in the leftward direction and a crowd moving in therightward direction are present in the capturing range of the fixedcamera 10.

In a case where a plurality of flows are present, the estimating unit2060 sets the estimation range for each crowd of a different flow andestimates the attribute distribution for each estimation range. Forexample, in FIGS. 14A and 14B, the estimating unit 2060 estimates theattribute distribution for two estimation ranges including theestimation range 60-1 positioned on the left side from the capturingrange of the moving camera 20, and the estimation range 60-2 positionedon the right side from the capturing range of the moving camera 20.

In the case of setting the estimation range for each crowd having adifferent moving direction, the first analyzing unit 2020 calculates themoving velocity of each crowd having a different moving direction. Forexample, in FIGS. 14A and 14B, the first analyzing unit 2020 calculatesthe moving velocities of the crowd moving in the leftward direction andthe crowd moving in the rightward direction. The first analyzing unit2020 calculates the position of the estimation range 60-1 and theposition of the estimation range 60-2 based on each calculated movingvelocity.

In FIG. 14A, the attribute distribution that represents the ratio of theattribute value (male:female=1:3) is calculated for the estimation range60. Therefore, the estimating unit 2060 estimates the attributedistribution in both of the estimation range 60-1 and the estimationrange 60-2 to be “male:female=1:3” which is the same as the attributedistribution in the capturing range of the moving camera 20.

In FIG. 14B, the attribute distribution that represents the number ofobjects having each attribute value is calculated for the estimationrange 60. In this case, the estimating unit 2060 estimates the totalnumber of objects included in the estimation range 60-1 and the totalnumber of objects included in the estimation range 60-2 based on theflow of each crowd in the capturing range of the fixed camera 10. Forexample, the estimating unit 2060 calculates the crowd density of thecrowd moving in the leftward direction and the crowd density of thecrowd moving in the rightward direction in the capturing range of thefixed camera 10. The estimating unit 2060 sets the total number ofobjects included in the estimation range 60-1 to be a value that isacquired by multiplying the crowd density of the crowd moving in theleftward direction in the capturing range of the fixed camera 10 and thearea of the estimation range 60-1. Similarly, the estimating unit 2060sets the total number of objects included in the estimation range 60-2to be a value that is acquired by multiplying the crowd density of thecrowd moving in the rightward direction in the capturing range of thefixed camera 10 and the area of the estimation range 60-2. Note that,for example, the estimating unit 2060 sets the area of the capturingrange of the fixed camera 10 to be the area of the estimation range 60-1and the estimation range 60-2.

In FIG. 14B, the crowd density of the crowd moving to the left is 4people/m², and the crowd density of the crowd moving to the right is 3people/m². The area of the estimation range is 10 m² which is the sameas the area of the capturing range 14. Thus, the estimating unit 2060estimates the total number of objects included in the estimation range60-1 to be 40, and the total number of objects included in theestimation range 60-2 to be 30.

Furthermore, the estimating unit 2060 estimates the ratio of theattribute value in the estimation range 60-1 and the estimation range60-2 to be the same as the ratio of the attribute value in the capturingrange of the moving camera 20. The estimating unit 2060 calculates theattribute distribution (the number of objects having each attributevalue) in the estimation range 60-1 from the total number of objectsincluded in the estimation range 60-1 and the ratio of the attributevalue in the estimation range 60-1. Similarly, the estimating unit 2060calculates the attribute distribution in the estimation range 60-2 fromthe total number of objects included in the estimation range 60-2 andthe ratio of the attribute value in the estimation range 60-2.

In FIG. 14B, the ratio of males to females included in the crowd in thecapturing range 24 is 1:3. Therefore, from this ratio and the totalnumber of objects estimated for each estimation range 60, the estimatingunit 2060 estimates the attribute distribution in the estimation range60-1 to be “10 males and 10 females”, and the attribute distribution inthe estimation range 60-2 to be “7.5 males and 22.5 females”. Note thatwhile the attribute distribution in the capturing range of the movingcamera is applied in the same manner for each direction, the attributedistribution may be individually calculated for each direction in a casewhere a crowd moving in each direction can be separated, and theattribute of each crowd can be individually estimated.

Superposition of Plurality of Attribute Distributions

Attribute distributions in a plurality of estimation ranges 60 that areestimated using different moving cameras 20 may overlap each other alongwith elapse of time. FIG. 15 is a diagram illustrating a scene in whicha plurality of the moving cameras 20 are present. In FIG. 15 , theestimation range 60-1 for which the attribute distribution is estimatedbased on the attribute distribution calculated for the capturing range24 of a moving camera 20-1 overlaps the estimation range 60-2 for whichthe attribute distribution is estimated based on the attributedistribution calculated for the capturing range 24 of a moving camera20-2.

In a case where a plurality of the estimation ranges 60 overlap eachother at a certain position, the estimating unit 2060 estimates theattribute distribution at the position by superposing the attributedistribution in each estimation range 60 using a predetermined rule. Forexample, the estimating unit 2060 sets the attribute distribution at theposition to be an attribute distribution that is calculated bystatistically processing the attribute distributions in the plurality ofestimation ranges 60.

At this point, the estimating unit 2060 may calculate the weighted meanof the attribute distributions in the plurality of estimation ranges 60by attributing a weight to the attribute distribution in each estimationrange 60 such that a larger weight is attributed to an attributedistribution having higher reliability. There are various methods ofranking the reliability of the attribute distribution in each estimationrange 60. For example, the estimating unit 2060 sets higher reliabilityfor the attribute distribution in the estimation range 60 having ashorter distance from the position of the moving camera 20 used forgenerating the attribute distribution. When the estimation range 60 isapart from the position of the moving camera 20 used for generating theattribute distribution, it is highly likely that the degree ofdifference between the actual motion of the crowd and the expectedmotion of the crowd is increased. For the same reason, the estimatingunit 2060 may set higher reliability for the attribute distribution inthe estimation range 60 for which a smaller amount of time elapses fromthe time of calculation of the attribute distribution.

Alternatively, the estimating unit 2060 may decide the reliability usinginformation related to a path such as the map information. For example,in a case where a location in which the crowd is likely to stay ispresent half way through, the velocity or the distribution of the crowdmay be changed in the location. Therefore, the estimating unit 2060 maydetermine whether or not a location satisfying a predetermined condition(the likelihood of the crowd staying, and the like) is included on apath between the current location of the estimation range 60 and alocation where the estimation range 60 is generated, and set thereliability of the attribute distribution in the estimation range 60 forwhich it is determined that such a location is included, to be lowerthan the reliability of the attribute distribution for which it isdetermined that such a location is not included. The predeterminedcondition may be set in advance in the estimating unit 2060, stored inthe storage device that can be accessed from the estimating unit 2060,or set by the user.

Alternatively, instead of the map information, a similar determinationmay be performed using information on the likelihood of staying and thelike that is measured in advance. Alternatively, instead of the measuredinformation, information that is estimated by simulating the movement ofthe crowd may be used. Various well-known crowd simulation technologiescan be used.

The second analyzing unit 2040 may use the attribute distributionestimated by the estimating unit 2060 to improve the accuracy ofcalculation of the attribute value of each object that is subsequentlyexecuted. Specifically, based on the estimated attribute distribution,the second analyzing unit 2040 recognizes that an object having acharacteristic attribute value for a certain specific attribute (forexample, a person having difficulty in walking) is present around thecapturing range of a certain moving camera 20 or approaches thecapturing range of the moving camera 20. The second analyzing unit 2040detects the specific attribute in detail when calculating the attributevalue for each object captured in the second surveillance image 22generated by the moving camera 20.

For example, the second analyzing unit 2040 changes an algorithm forcalculating the attribute value of the specific attribute to analgorithm that is more detailed than a generally used algorithm. Forexample, the second analyzing unit 2040 changes an algorithm ofdetecting a wheelchair from a relatively simple algorithm of detecting awheelchair from the whole shape of each object to a detailed algorithmof detecting a wheelchair by examining small parts and the like.

When the algorithm of detecting a wheelchair from the whole shape ofeach object is used, the second analyzing unit 2040 may not be able todetect a wheelchair in a case where, for example, a part of thewheelchair captured in the second surveillance image 22 is covered byanother person and not seen. On the other hand, when the algorithm ofexamining small parts is used, the second analyzing unit 2040 can detectthe wheelchair at a high probability even if a part of the wheelchair iscovered. Alternatively, the second analyzing unit 2040 may increase thedetection rate by changing the algorithm of detecting the whole shape ofeach object to use a dictionary that is acquired by learning recognitionfor each direction.

Method of Calculating Capturing Range

Various processes described thus far use the capturing range of thefixed camera 10 and the capturing range of the moving camera 20. Amethod of calculating those capturing ranges will be described.

The capturing range of the fixed camera 10 can be calculated based oncamera parameters of the fixed camera 10 at a time when the firstsurveillance image 12 is generated. The camera parameters are parametersthat represent the position, the pose (the angle of rotation in thehorizontal direction and the angle of rotation in the verticaldirection), the magnitude of the angle of view (zoom ratio), and thelike of a camera. The information processing apparatus 2000 calculatesthe capturing range (a space in the real world) of the fixed camera 10using the map information and the value of each parameter. A well-knowntechnique can be used for the method of calculating the capturing rangeof the camera using the map information, the position of the camera, thepose of the camera, and the angle of view of the camera. Note that sincethe position of the fixed camera 10 is fixed, a relationship between thecapturing range of the fixed camera 10 and the camera parameters of thefixed camera 10 can be set in advance.

There are various methods of acquiring the camera parameters of thefixed camera 10 at the time when the first surveillance image 12 isgenerated. For example, the camera parameters are included in metadataof the first surveillance image 12. Alternatively, for example, thecamera parameters of the fixed camera 10 can be acquired from a controldevice that controls the pose of the fixed camera 10. In this case, forexample, the information processing apparatus 2000 acquires a pair ofinformation indicating a time and the camera parameters of the fixedcamera 10 at that time. Note that since the position of the fixed camera10 is fixed, the camera parameter that represents the position of thefixed camera 10 can be recognized in advance.

The capturing range of the moving camera 20 can be calculated based onthe map information and camera parameters of the moving camera 20 at atime when the second surveillance image 22 is generated. The value of aparameter representing the position of the moving camera 20 can berecognized using, for example, a global positioning system (GPS) sensorthat is installed in the moving camera 20. The value of a parameterrepresenting the inclination of the moving camera 20 in the verticaldirection can be recognized using, for example, an acceleration sensorthat is installed in the moving camera 20. The value of a parameterrepresenting the inclination of the moving camera 20 in the horizontaldirection can be recognized using, for example, an electronic compassthat is installed in the moving camera 20. The value of a parameterrepresenting the magnitude of the angle of view of the moving camera 20can be acquired from, for example, a control device that controls themoving camera 20. For example, in a case where the moving camera 20 is acamera that is installed in a portable terminal, the parameterrepresenting the angle of view of the moving camera 20 can be acquiredfrom the portable terminal. Similarly, when the GPS sensor, theacceleration sensor, the electronic compass, and the like are installedin the portable terminal, the information processing apparatus 2000 canacquire the values of the parameter representing the position of themoving camera 20, the parameter representing the inclination of themoving camera 20 in the vertical direction, and the parameterrepresenting the inclination of the moving camera 20 in the horizontaldirection from the portable terminal. Note that the method of acquiringthe value of each parameter is not limited to the above method.

The information processing apparatus 2000 calculates the capturing range(a space in the real world) of the moving camera 20 using the mapinformation and the value of each parameter. A well-known technique canbe used for the method of calculating the capturing range of the camerausing the map information, the position of the camera, the pose of thecamera, and the angle of view of the camera.

The method of acquiring the camera parameters of the moving camera 20 atthe time when the second surveillance image 22 is generated is the sameas the method of acquiring the camera parameters of the fixed camera 10at the time when the first surveillance image 12 is generated.

Association Between Fixed Camera 10 and Moving Camera 20

As described above, the estimating unit 2060 estimates the flow of thecrowd in the capturing range of the moving camera 20 based on the flowof the crowd in the capturing range of the fixed camera 10. In a casewhere a plurality of the fixed cameras 10 are present, the estimatingunit 2060 uses one or more fixed cameras 10 in order to estimate theflow of the crowd in the capturing range of a certain moving camera 20.

At this point, there are various methods of deciding which fixed camera10 is to be used. For example, one or more fixed cameras 10 areassociated in advance with the moving camera 20. In this case, in orderto estimate the flow of the crowd in the capturing range of a certainmoving camera 20, the estimating unit 2060 uses the fixed cameras 10that are associated in advance with the moving camera 20. Theassociation may be set in advance in the estimating unit 2060, stored inthe storage device that can be accessed from the estimating unit 2060,or set by the user.

Alternatively, for example, in order to estimate the flow of the crowdin the capturing range of a certain moving camera 20, the estimatingunit 2060 may use the fixed camera 10 that has a short distance from themoving camera 20. For example, the estimating unit 2060 estimates theflow of the crowd in the capturing range of the moving camera 20 usingthe fixed camera 10 that has the shortest distance from the movingcamera 20.

Note that in the case of estimating the flow of the crowd in thecapturing range of the moving camera 20 using the plurality of fixedcameras 10, the estimating unit 2060 estimates the flow of the crowd inthe capturing range of the moving camera 20 based on the flow of thecrowd in the capturing range of each fixed camera 10. The estimatingunit 2060 estimates the flow of the crowd in the capturing range of themoving camera 20 by statistically processing the plurality of estimatedflows. At this point, the estimating unit 2060 may calculate a weightedmean by assigning a larger weight to the flow that is estimated usingthe fixed camera 10 having a shorter distance from the moving camera 20.It is considered that the estimation accuracy is higher for the flowthat is estimated using the fixed camera 10 having a shorter distancefrom the moving camera 20.

Relationship Between Data Used for Estimation and Estimation Timing

There are various relationships between a time when various types ofdata (the first surveillance image 12 and the second surveillance image22) used for generating the attribute distribution by the informationprocessing apparatus 2000 are generated, and for which time theattribute distribution is generated. FIGS. 16A-16C are diagramsillustrating a relationship between the time when the data is generated,and the time when the attribute distribution is generated. In FIG. 16A,the estimating unit 2060 estimates the attribute distribution related toa certain time using data that is generated before the time. In FIG.16B, the estimating unit 2060 estimates the attribute distributionrelated to a certain time using data that is generated after the time.In addition, in FIG. 16C, the estimating unit 2060 estimates theattribute distribution related to a certain time using both the datagenerated before the time and the data generated after the time.

A method of estimating the attribute distribution related to a certaintime using the data generated after the time will be described. Asdescribed above, the information processing apparatus 2000 estimates theattribute distribution of objects in a range not included in thecapturing range of the moving camera 20 by moving the attributedistribution of the objects in the capturing range of the moving camera20 based on the flow of the crowd in the capturing range of the fixedcamera 10. At this point, the attribute distribution for a time beforethe time when the first surveillance image 12 and the secondsurveillance image 22 are generated can be estimated by performing theprocess of “moving the attribute distribution of the objects in thecapturing range of the moving camera 20” in a direction to the past.

FIGS. 17A and 17B are diagrams illustrating the method of estimating theattribute distribution related to a certain time using the datagenerated after the time. In FIG. 17A, at time t, a crowd having anattribute distribution of “male:female=1:2” is moving in the rightwarddirection at a velocity of 10 m/s. Assume that the unit of time isseconds.

From the flow and the attribute distribution of the crowd, this crowd attime t−1 which is one second before time t is estimated to be positionedfrom its position at time t by 10 m in the leftward direction.Therefore, the estimating unit 2060 estimates the attribute distributionfor the estimation range 60-1 at time t−1 as illustrated in FIGS. 17Aand 17B.

Assume that the above method of estimating the attribute distribution ofthe estimation range using the distribution function p is used in thecase of estimating the attribute distribution at a certain time usingthe data generated after the time. In this case, the position of thecrowd at certain time t_−n in the past is represented by Expression (6).

x _(−n)(t _(−n))=x _(−n+1)(t _(−n+1))−v(x _(−n+1)(t _(−n+1)),t_(−n+1))Δt   (6)

The estimating unit 2060 acquires the distribution ha(x, t_−k) at timet_−k=t0−kΔt using Expression (6).

By estimating the attribute distribution related to a certain time usingthe data generated after the time, it is possible to estimate theattribute distribution of the objects at the time including theattribute distribution of the objects that cannot be grasped from thedata generated before the time. For example, in a usage environmentwhere a certain degree of delay is allowed in the estimation of theattribute distribution, a more detailed attribute distribution can begrasped using information in the future (data generated after a certaintime) as illustrated in FIG. 16C.

Method of Using Attribute Distribution

The attribute distribution estimated by the information processingapparatus 2000 can be used in various forms. For example, it is achievedto appropriately support the crowd by grasping the attributedistribution in the location of the surveillance target.

For example, according to the information processing apparatus 2000, itis possible to grasp the distribution of the crowd that needs support inthe location of the surveillance target. The crowd that needs support isexemplified by a crowd that includes a senior person, a child, a personhaving difficulty in walking, or the like. By grasping the distributionof such a crowd, it is possible to appropriately assign a security guard(including a so-called guide who performs only guiding) to a locationwhere a large number of people need support.

Assume that the information processing apparatus 2000 is a terminal usedat a surveillance center from which instructions are provided tosecurity guards. In this case, an administrator at the surveillancecenter recognizes a location where a crowd that needs support ispresent. In a case where the number of security guards is insufficientin the location, the administrator can direct a security guard in adifferent location (for example, a location where a large number ofpeople do not need support) to the location.

Assume that the information processing apparatus 2000 is a portableterminal that is used by each security guard on site. In this case, thesecurity guards can grasp the distribution of the crowd needing supportusing their portable terminals. In a case where the number of securityguards is insufficient in a location where a large number of such crowdsare present, each security guard can support the crowd needing supportby going to the location.

Another example of people who need support is exemplified by foreigners.For example, it is preferable to assign a security guard who speaksEnglish to a location where a large number of foreigners using Englishare distributed. Therefore, by grasping the distribution of foreignersusing the information processing apparatus 2000, it is possible torecognize the location to which a security guard is to be deployed, andthe language that the security guard is to speak.

In crowd surveillance in a sports match venue, it is preferable toappropriately guide supporters of a losing team. Generally, supportersof a losing team feel frustration. Thus, it is preferable to reduce thefrustration of the supporters of the losing team by politely treatingthe supporters of the losing team such as guiding the supporters of thelosing team to leave the sports match venue preferentially oversupporters of a winning team. In addition, it is preferable toappropriately separate paths of the supporters such that the supportersof the winning team do not meet the supporters of the winning team.

Therefore, the administrator at the surveillance center or a securityguard grasps the distribution of the supporters of the winning team andthe supporters of the losing team using the information processingapparatus 2000. By doing so, the administrator or the security guard cangrasp whether or not the above various types of guiding are beingappropriately performed.

For example, assume that it is grasped using the attribute distributionthat the motion of the supporters of the losing team is stagnant whereasan amount of motion of the supporters of the winning team is large. Inthis case, it is understood that guiding such that “the supporters ofthe losing team leaves the sports match venue preferentially” is notbeing appropriately performed. In addition, for example, by recognizingthat the supporters of the winning team and the supporters of the losingteam are distributed in the same location, it is understood that guidingsuch that “the supporters of the winning team do not meet the supportersof the winning team” is not being appropriately performed. By causingthe security guard to grasp those situations, it is possible to performappropriate guiding by, for example, changing the layout of securityguards.

In addition, the attribute distribution that is grasped using theinformation processing apparatus 2000 can be used for product sales. Forexample, in a case where a salesperson sells products at an event venueand the like, it is possible to grasp in which location what goods aregoing to be sold by grasping the attribute distribution. For example, itis preferable to direct a salesperson having goods for females to alocation where a large number of females are distributed.

In addition, in a case where a salesperson sells goods while moving inan event venue, the moving path of the salesperson can be optimized bygrasping the attribute distribution. For example, a salesperson havinggoods for females has more opportunities of selling goods when passingalong a path where a large number of females are distributed, than whenpassing along a path where a large number of males are distributed.Therefore, in such a case, the distribution of females is grasped usingthe information processing apparatus 2000, and the moving path of thesalesperson is decided such that the salesperson always passes through alocation where females are distributed. By doing so, a more number ofgoods can be sold.

The above method of use handles a person as an object. However, asdescribed above, each object may be other than a person. For example,assume that the information processing apparatus 2000 handles a vehicleas an object. In this case, the attribute of each object is, forexample, the type of the vehicle (a passenger car, a bus, a truck, ataxi, a tank lorry, or the like).

By handling such an attribute in the information processing apparatus2000, for example, the distribution of vehicles on the road can begrasped for each type of vehicle. For example, the cause of congestioncan be found by grasping such a distribution for a road where congestionis likely to occur. For example, when a phenomenon in which largevehicles that are likely to have a low velocity are concentrated in oneplace at a certain time period is found, such a phenomenon may be thecause of congestion.

In addition, for example, a location where transportation isinsufficient can be determined by seeing the distribution of buses ortaxis. Paths through which buses pass can be recognized by seeing aroute map and the like of buses. However, only the paths through whichthe buses may pass can be found on the route map, and it is impossibleto grasp the actual distribution of buses at a certain time. Thus, evenwhen the route map is used, it is impossible to grasp a state wheretransportation such as buses and taxis is insufficient in a specificplace at a certain time period. On the other hand, when the informationprocessing apparatus 2000 is used, the actual distribution of buses andtaxis can be grasped. Thus, it is possible to grasp a state wheretransportation is insufficient.

Method of Grasping Attribute Distribution

There are various methods of causing the user of the informationprocessing apparatus 2000 to grasp the attribute distribution. Forexample, the estimating unit 2060 superimposes the calculated attributedistribution on the map of the location of the surveillance target andoutputs the superimposed map. For example, this map is displayed on adisplay device. This display device may be connected to the informationprocessing apparatus 2000, or may be connected to other apparatuses. Inthe case of displaying the map on the display device that is connectedto an apparatus other than the information processing apparatus 2000,the information processing apparatus 2000 transmits informationrepresenting the map to the apparatus to which the display device isconnected.

FIG. 18 is a diagram illustrating a map 200 that is displayed on adisplay device 70. The surveillance target in FIG. 18 is the indoorfloor. In FIG. 18 , a plurality of the fixed cameras 10 are installed.In addition, a plurality of the moving cameras 20 are present. In FIG.18 , the positions of the fixed cameras 10 and the moving cameras 20 aredisplayed by icons. Note that the positions of the fixed cameras 10 andthe positions of the moving cameras 20 on the map 200 can be calculatedusing positional information of the fixed cameras 10, positionalinformation of the moving cameras 20, and positional informationrepresented by the map 200. In addition, in a case where the arrangementof the fixed cameras 10 is fixed, the positions of the fixed cameras 10may be illustrated on the map 200 in advance. In addition, informationthat indicates the type of each moving camera 20 may be displayedtogether. For example, this information is information with which it ispossible to identify whether each moving camera 20 is a moving cameraworn by a security guard or a moving camera equipped in a robot. Inaddition, information related to the security guard or the robot may beprovided together. This information is information that indicateswhether or not the security guard speaks a specific foreign language,information that indicates whether or not the security or the robotcarries a device providing machine translation, or the like.

The information processing apparatus 2000 repeatedly estimates theattribute distribution using the plurality of fixed cameras 10 and theplurality of moving cameras 20. Consequently, the attribute distributionis estimated for various locations on the map 200. FIG. 19 is a diagramillustrating the map 200 on which the estimated attribute distributionis superimposed. In FIG. 19 , the attribute distribution is representedby a histogram. This histogram represents the ratio of senior people toother people. A location in dark color represents a location where theratio of senior people is high. The administrator at the surveillancecenter, the security guard on site, and the like can grasp the attributedistribution by seeing the map 200. Specifically, it is possible tograsp the location where a large number of senior people aredistributed.

As illustrated using FIGS. 8A and 8B and FIGS. 9A and 9B, based on theflow of the crowd and the attribute distribution of the objectscalculated for a certain time, the information processing apparatus 2000can estimate the attribute distribution of the objects in the estimationrange 60 not included in the capturing range 24 at a time in the futurefrom the time. For example, in FIGS. 8A and 8B, the attributedistribution of the objects in the estimation range 60-1 at time t+1 isestimated based on the flow of the crowd in the capturing range 14 ofthe fixed camera 10 and the attribute distribution of the objects in thecapturing range 24 of the moving camera 20 calculated for time t. Thus,according to the information processing apparatus 2000, the attributedistribution in the future can be estimated.

Note that in the example where the estimation range 60 having aninfinite area is handled, the attribute distribution that is estimatedfor time tn in the future is output by setting tn in Expression (5) to atime in the future.

By grasping the attribute distribution in the future, an event that mayoccur in the future can be dealt with in advance. For example, byestimating the attribute distribution in the future, the security guardand the like can recognize an event in the future such that “abottleneck occurs due to an increase in the density of people havingdifficulty in walking in a certain location, and a smooth flow of thecrowd is hindered”, an event in the future such that “the supporters ofthe losing team merge with the supporters of the winning team in acertain location”, and the like in advance. In such a case, theoccurrence of such an event can be prevented in advance by directing thesecurity guard to the location in advance to perform appropriateguiding. In addition, for example, when a salesperson can grasp theattribute distribution in the future such that “a large number offemales gather in a certain location”, goods can be smoothly sold bymaking the salesperson to move to the location with goods for females inadvance.

Example Embodiment 2

FIG. 20 is a block diagram illustrating the information processingapparatus 2000 of Example Embodiment 2. The information processingapparatus 2000 of Example Embodiment 2 has the same function as theinformation processing apparatus 2000 of Example Embodiment 1 except forthe points described below.

The information processing apparatus 2000 of Example Embodiment 2 has amodel acquiring unit 2080. The model acquiring unit 2080 acquires amovement model that indicates the feature of the movement of the crowdfor each attribute value for a certain attribute. For example, themovement model indicates a different moving velocity for each attributevalue.

The estimating unit 2060 uses the attribute distribution calculated forthe capturing range of the moving camera 20 at a certain time tocalculate the distribution of each object having different attributevalues for a subsequent different time. That is, the estimating unit2060 calculates the attribute distribution of the crowd having eachattribute value by considering that the crowd included in the capturingrange of the moving camera 20 at a certain time is being divided into aplurality of crowds having different attribute values as time elapses.

FIGS. 21A-21C are diagrams illustrating a scene in which the crowdincluded in the capturing range of the moving camera 20 is divided intoa plurality of crowds having different attribute values. At time t0,people having different attribute values such as a child, a youth, and asenior person are mixed in a crowd 30-1. The moving velocity of eachperson is increased in the order of a youth, a child, and a seniorperson. Then, at time t1, a crowd 30-2 of youths, a crowd 30-3 ofchildren, and a crowd 30-4 of senior people in this order move to aposition separated from the initial position. At time t2, the distancesamong the crowds are further increased.

Expression (7) is a specific example of the movement model and is oneexample of a movement model corresponding to the age bracket. In a casewhere the magnitude of the flow vector calculated for the whole crowd isv, m(a, v) represents the velocity of the crowd of objects having a asthe attribute value of the age bracket.

$\begin{matrix}{{m( {a,v} )} = \{ \begin{matrix}{0.9*v} & {{\ldots a} = {Children}} \\v & {{\ldots a} = {Adults}} \\{0.8*v} & {{\ldots a} = \begin{matrix}{Senior} \\{People}\end{matrix}}\end{matrix} } & (7)\end{matrix}$

Assume that the estimating unit 2060 calculates the attributedistribution for the specified range having an infinite area that isdescribed as one example in Example Embodiment 1. In this case, theestimating unit 2060 uses Expression (8) instead of Expression (2) as anexpression for calculating the position xn(tn) of the crowd having a asthe attribute value of the attribute A at time tn=t0+nΔt.

x _(n)(t _(n))=x _(n−1)(t _(n−1))+m(a, v(x _(n−1)(t _(n−1)),t _(n−1)))Δt  (8)

Note that the method of acquiring the movement model by the modelacquiring unit 2080 is not limited. For example, the movement model maybe set in advance in the model acquiring unit 2080, stored in a storagedevice that can be accessed from the model acquiring unit 2080, or setby the user.

Hardware Configuration Example

The information processing apparatus 2000 of Example Embodiment 2 isimplemented using the computer 1000 in the same manner as ExampleEmbodiment 1 (refer to FIG. 4 ). In the present example embodiment, theprogram modules stored in the storage 1080 further include a programthat implements each function described in the present exampleembodiment.

Advantageous Effect

According to the present example embodiment, the flow of the crowd isestimated using the movement model that is set in association with theattribute. Thus, the flow of the crowd can be estimated with higheraccuracy. Consequently, the attribute distribution can be estimated withhigher accuracy.

Example Embodiment 3

FIG. 22 is a block diagram illustrating the information processingapparatus 2000 of Example Embodiment 3. The information processingapparatus 2000 of Example Embodiment 3 has the same function as theinformation processing apparatus 2000 of Example Embodiment 1 except forthe points described below.

The information processing apparatus 2000 of Example Embodiment 3 has acontrol information generating unit 2100. The control informationgenerating unit 2100 generates control information based on theattribute distribution. The control information generating unit 2100displays the generated control information on a display device ornotifies the user of the generated control information by email and thelike. This display device may be connected to the information processingapparatus 2000, or may be connected to other apparatuses. In the case ofdisplaying the control information on the display device that isconnected to an apparatus other than the information processingapparatus 2000, the information processing apparatus 2000 transmits thecontrol information to the apparatus to which the display device isconnected.

The control information indicates various types of information. Forexample, the control information indicates a location where a largenumber of objects having a specific attribute value are present. In thiscase, the control information generating unit 2100 generates the controlinformation based on the distribution of an attribute related to anattribute value for which support is needed. For example, in a casewhere the density of objects having a specific attribute value is higherthan or equal to a predetermined value in a certain location, thecontrol information generating unit 2100 generates the controlinformation that indicates the location.

The control information generating unit 2100 may generate and providedifferent control information according to the magnitude of the densityof objects. For example, the control information generating unit 2100generates control information that indicates the degree of necessity ofsupport for each range by superimposing a yellow frame in a range wherethe degree of the density of objects is medium (for example, higher thanor equal to a first threshold and lower than or equal to a secondthreshold), and superimposing a red frame in a range where the densityof objects is high (for example, higher than or equal to the secondthreshold) on the map 200 illustrated in FIG. 19 . Note that in additionto the method of superimposing the frame, the method of provision canuse various methods such as a method of superimposing specific color ina region, and a method of flashing the frame. In addition, the firstthreshold and the second threshold may be stored in advance in thecontrol information generating unit 2100, stored in a storage devicethat can be accessed from the control information generating unit 2100,or set by the user.

The specific attribute value is an attribute value that represents anobject such as a senior person or a person having difficulty in walkingwho needs support of the security guard and the like. For example, inthe case of generating the control information that indicates thelocation where a large number of senior people are present, the controlinformation generating unit 2100 uses the attribute distribution relatedto the age bracket.

By generating such control information, the user (security guard and thelike) of the information processing apparatus 2000 can recognize alocation where a large number of objects having a specific attributevalue (for example, objects needing support) are present. Thus, crowdguiding and the like can be more appropriately performed.

Note that the control information may indicate a location where a largenumber of objects having a specific attribute value are present, andwhere a security guard is not deployed nearby. In this case, the controlinformation generating unit 2100 uses information representing thelayout of security guards in addition to the attribute distribution. Theposition of each security guard can be determined based on positionalinformation (GPS coordinates and the like) of the portable terminalpossessed by each security guard.

By generating such control information, the layout of security guardscan be appropriately changed by, for example, directing a security guardto a place of senior people where support is insufficient. Consequently,crowd guiding and the like can be more appropriately performed.

In addition, for example, the control information may indicate alocation where the reliability of the attribute distribution isconsidered to be low. The location where the reliability of theattribute distribution is low is, for example, a location where themoving camera 20 is not present nearby. Since the attribute distributionin a range outside the capturing range of the moving camera 20 isestimated based on the attribute distribution calculated for thecapturing range of the moving camera 20, it is considered that theaccuracy of the estimated attribute distribution is lower for a locationhaving a longer distance from the moving camera 20. In addition, forexample, the location where the reliability of the attributedistribution is low is a location for which data (the first surveillanceimage 12 and the second surveillance image 22) used for the estimationof the attribute distribution is old data. Since older data used inestimation causes a larger difference between the state of the crowd atthe time when the data is generated, and the state of the crowd at thecurrent time, it is considered that the accuracy of the attributedistribution is low.

For example, the control information generating unit 2100 calculates arange of a predetermined distance from the position of each movingcamera 20 for a predetermined surveillance location (for example, alocation included in the map 200). When a location that is not includedin any of the calculated ranges is present in the map 200, the controlinformation generating unit 2100 handles the location as a locationwhere the reliability of the attribute distribution is low. The controlinformation generating unit 2100 generates control information thatindicates the location. The predetermined distance may be set in advancein the control information generating unit 2100, stored in the storagedevice that can be accessed from the control information generating unit2100, or set by the user.

By generating such control information, it can reduce the location wherethe reliability of the attribute distribution is low by, for example,directing the security guard possessing the moving camera 20 to thelocation where the reliability of the attribute distribution is low.Consequently, the reliability of the attribute distribution for thewhole surveillance location can be improved, and crowd guiding and thelike can be more appropriately performed.

Hardware Configuration Example

The information processing apparatus 2000 of Example Embodiment 2 isimplemented using the computer 1000 in the same manner as ExampleEmbodiment 1 (refer to FIG. 4 ). In the present example embodiment, theprogram modules stored in the storage 1080 further include a programthat implements each function described in the present exampleembodiment.

Advantageous Effect

According to the present example embodiment, the above various types ofcontrol information are generated. The security guard and the like whoare the user of the information processing apparatus 2000 canappropriately perform crowd guiding and the like using the controlinformation.

While the example embodiments of the invention are described heretoforewith reference to the drawings, the example embodiments areillustrations of the invention. A combination of the exampleembodiments, or other various configurations can also be employed.

Hereinafter, reference examples will be appended.

-   -   1. An information processing apparatus including:        -   a first analyzing unit that calculates a flow of a            collection of objects in a capturing range of a fixed camera            using a first surveillance image, the first surveillance            image being generated by the fixed camera, the fixed camera            being a camera a position of which is fixed;        -   a second analyzing unit that calculates a distribution of an            attribute of objects in a capturing range of a moving camera            using a second surveillance image, the second surveillance            image being generated by the moving camera, the moving            camera being a camera a position of which is not fixed; and        -   an estimating unit that estimates the distribution of the            attribute of the objects for an estimation range including a            range not included in the capturing range of the moving            camera based on the distribution of the attribute of the            objects in the capturing range of the moving camera and the            flow of the collection of objects in the capturing range of            the fixed camera.    -   2. The information processing apparatus according to 1,        -   in which the estimating unit estimates the distribution of            the attribute of the objects in the estimation range by            moving the distribution of the attribute of the objects in            the capturing range of the moving camera based on the flow            of the collection of the objects in the capturing range of            the fixed camera.    -   3. The information processing apparatus according to 2,        -   in which in a case where the capturing ranges of the fixed            camera and the moving camera do not overlap each other, the            estimating unit estimates a flow of a collection of objects            in the capturing range of the moving camera based on the            flow of the collection of the objects in the capturing range            of the fixed camera, and estimates the distribution of the            attribute of the objects in the estimation range by moving            the distribution of the attribute of the objects in the            capturing range of the moving camera based on the estimated            flow of the collection of the objects.    -   4. The information processing apparatus according to 2, further        including:        -   a movement model acquiring unit that acquires, in            association with an attribute value of an object, a movement            model which represents a feature of movement of that object,        -   in which the estimating unit calculates a flow of each            collection of objects having a different attribute value            based on the flow of the collection of the objects in the            capturing range of the fixed camera and the movement model,            and estimates the distribution of the attribute of the            objects in the estimation range by moving the distribution            of the attribute of the objects in the capturing range of            the moving camera based on the flow of each collection of            objects having a different attribute value.    -   5. The information processing apparatus according to any one of        1 to 4,        -   in which the first analyzing unit calculates density of the            collection of the objects in the capturing range of the            fixed camera using the first surveillance image, and        -   the estimating unit estimates the number of objects having            each attribute value for the estimation range by calculating            density of a collection of objects in the estimation range            as the same density as the density of the collection of the            objects in the capturing range of the fixed camera.    -   6. The information processing apparatus according to any one of        1 to 5, further including:        -   a control information generating unit that generates control            information which indicates a location where a large number            of objects having a predetermined attribute value are            present in the estimated attribute distribution, or a            location where reliability of the estimated attribute            distribution is low.    -   7. The information processing apparatus according to any one of        1 to 6, in which a collection of objects captured in the first        surveillance image and a collection of objects captured in the        second surveillance image have at least a part of objects in        common.    -   8. The information processing apparatus according to any one of        1 to 7,        -   in which each object is a person, and the attribute of each            object is an age bracket, a sex, nationality, a group to            which the object belongs, presence of belongings, or whether            or not the object is a person having difficulty in walking.    -   9. The information processing apparatus according to any one of        1 to 8,        -   in which the capturing range of the fixed camera is wider            than the capturing range of the moving camera.    -   10. A control method executed by a computer, including:        -   a first analyzing step of calculating a flow of a collection            of objects in a capturing range of a fixed camera using a            first surveillance image, the first surveillance image being            generated by the fixed camera, the fixed camera being a            camera a position of which is fixed;        -   a second analyzing step of calculating a distribution of an            attribute of objects in a capturing range of a moving camera            using a second surveillance image, the second surveillance            image being generated by the moving camera, the moving            camera being a camera a position of which is not fixed; and        -   an estimating step of estimating the distribution of the            attribute of the objects for an estimation range including a            range not included in the capturing range of the moving            camera based on the distribution of the attribute of the            objects in the capturing range of the moving camera and the            flow of the collection of objects in the capturing range of            the fixed camera.    -   11. The control method according to 10,        -   in which in the estimating step, the distribution of the            attribute of the objects in the estimation range is            estimated by moving the distribution of the attribute of the            objects in the capturing range of the moving camera based on            the flow of the collection of the objects in the capturing            range of the fixed camera.    -   12. The control method according to 11,        -   in which in a case where the capturing ranges of the fixed            camera and the moving camera do not overlap each other, in            the estimating step, a flow of a collection of objects in            the capturing range of the moving camera is estimated based            on the flow of the collection of the objects in the            capturing range of the fixed camera, and the distribution of            the attribute of the objects in the estimation range is            estimated by moving the distribution of the attribute of the            objects in the capturing range of the moving camera based on            the estimated flow of the collection of the objects.    -   13. The control method according to 11, further including:        -   a movement model acquiring step of acquiring, in association            with an attribute value of an object, a movement model which            represents a feature of movement of that object,        -   in which in the estimating step, a flow of each collection            of objects having a different attribute value is calculated            based on the flow of the collection of the objects in the            capturing range of the fixed camera and the movement model,            and the distribution of the attribute of the objects in the            estimation range is estimated by moving the distribution of            the attribute of the objects in the capturing range of the            moving camera based on the flow of each collection of            objects having a different attribute value.    -   14. The control method according to any one of 10 to 13,        -   in which in the first analyzing step, density of the            collection of the objects in the capturing range of the            fixed camera is calculated using the first surveillance            image, and        -   in the estimating step, the number of objects having each            attribute value is estimated for the estimation range by            calculating density of a collection of objects in the            estimation range as the same density as the density of the            collection of the objects in the capturing range of the            fixed camera.    -   15. The control method according to any one of 10 to 14,        -   in which in the first analyzing step, density of the            collection of the objects in the capturing range of the            fixed camera for a plurality of times is calculated using            each of a plurality of the first surveillance images, in the            second analyzing step, density of the collection of the            objects in the capturing range of the moving camera for a            plurality of times is calculated using each of a plurality            of the second surveillance images, and        -   in the estimating step, the distribution of the attribute of            the objects in the estimation range is estimated based on            the distribution of the attribute of the objects in the            capturing range of the moving camera and the flow of the            collection of the objects in the capturing range of the            fixed camera.    -   16. The control method according to any one of 10 to 15, further        including:        -   a control information generating step of generating control            information which indicates a location where a large number            of objects having a predetermined attribute value are            present in the estimated attribute distribution, or a            location where reliability of the estimated attribute            distribution is low.    -   17. The control method according to any one of 11 to 16,        -   in which a collection of objects captured in the first            surveillance image and a collection of objects captured in            the second surveillance image have at least a part of            objects in common.    -   18. The control method according to any one of 10 to 17,        -   in which each object is a person, and        -   the attribute of each object is an age bracket, a sex,            nationality, a group to which the object belongs, presence            of belongings, or whether or not the object is a person            having difficulty in walking.    -   19. The control method according to any one of 10 to 18,        -   in which the capturing range of the fixed camera is wider            than the capturing range of the moving camera.    -   20. A program that causes a computer to execute each step of the        control method according to any one of 10 to 19.

1. A video surveillance system comprising: at least one memory storinginstructions; and at least one processor coupled to the at least onememory, the at least one processor being configured to execute theinstructions to: acquire a captured image captured by a surveillancecamera; output a different attribute according to a person's belongingsto a person reflected in the captured image; and output a result ofstatistical processing based on an output result of the attribute. 2.The video surveillance system according to claim 1, wherein thestatistical process is a process for calculating a number of persons foreach attribute.
 3. The video surveillance system according to claim 1,wherein the at least one processor is further configured to superimposea frame according to the attribute of the person captured by thesurveillance camera on an image indicating an area monitored by thesurveillance camera.
 4. The video surveillance system according to claim1, wherein the at least one processor is further configured to:calculate a flow of persons from the captured image; and estimateattribute distribution in a range not included in a capturing range ofthe surveillance camera based on the flow of persons and the statisticalprocessing of the attribute.
 5. The video surveillance system accordingto claim 4, wherein the at least one processor is further configured to:acquire the flow of persons based on the captured image captured by afixed camera fixed to wall, pillar or ceiling of a route between theevent venue and the nearest station; and estimate, based on the resultof the statistical processing and the flow of persons, the distributionof the attribute in a range not included in the capturing range of thesurveillance camera, wherein the surveillance camera is a movable movingcamera.
 6. The video surveillance system according to claim 1, whereinthe distribution of the attribute in a range not included in thecaptured range of the surveillance camera is estimated using theinformation estimated by performing a crowd movement simulation.
 7. Thevideo surveillance system according to claim 1, wherein the result ofthe statistical processing is output to a mobile terminal maintained bythe security guard at the site.
 8. A video surveillance method executedby a computer, the video surveillance method comprising: acquiring acaptured image captured by a surveillance camera; outputting a differentattribute according to a person's belongings to a person reflected inthe captured image; and outputting a result of statistical processingbased on an output result of the attribute.
 9. The video surveillancemethod according to claim 8, wherein the statistical process is aprocess for calculating a number of persons for each attribute.
 10. Thevideo surveillance method according to claim 8, further comprisingsuperimposing a frame according to the attribute of the person capturedby the surveillance camera on an image indicating an area monitored bythe surveillance camera.
 11. The video surveillance method according toclaim 8, further comprising: calculating a flow of persons from thecaptured image; and estimating attribute distribution in a range notincluded in a capturing range of the surveillance camera based on theflow of persons and the statistical processing of the attribute.
 12. Thevideo surveillance method according to claim 11, further comprising:acquiring the flow of persons based on the captured image captured by afixed camera fixed to wall, pillar or ceiling of a route between theevent venue and the nearest station; and estimating, based on the resultof the statistical processing and the flow of persons, the distributionof the attribute in a range not included in the capturing range of thesurveillance camera, wherein the surveillance camera is a movable movingcamera.
 13. The video surveillance method according to claim 8, whereinthe distribution of the attribute in a range not included in thecaptured range of the surveillance camera is estimated using theinformation estimated by performing a crowd movement simulation.
 14. Thevideo surveillance method according to claim 8, wherein the result ofthe statistical processing is output to a mobile terminal maintained bythe security guard at the site.
 15. A non-transitory computer-readablemedium storing a program for causing a computer to perform operations,the operations comprising: acquiring a captured image captured by asurveillance camera; outputting a different attribute according to aperson's belongings to a person reflected in the captured image; andoutputting a result of statistical processing based on an output resultof the attribute.
 16. The non-transitory computer-readable mediumaccording to claim 15, wherein the statistical process is a process forcalculating a number of persons for each attribute.
 17. Thenon-transitory computer-readable medium according to claim 15, whereinthe operations further comprise superimposing a frame according to theattribute of the person captured by the surveillance camera on an imageindicating an area monitored by the surveillance camera.
 18. Thenon-transitory computer-readable medium according to claim 15, whereinthe operations further comprise: calculating a flow of persons from thecaptured image; and estimating attribute distribution in a range notincluded in a capturing range of the surveillance camera based on theflow of persons and the statistical processing of the attribute.
 19. Thenon-transitory computer-readable medium according to claim 15, whereinthe distribution of the attribute in a range not included in thecaptured range of the surveillance camera is estimated using theinformation estimated by performing a crowd movement simulation.
 20. Thenon-transitory computer-readable medium according to claim 15, whereinthe result of the statistical processing is output to a mobile terminalmaintained by the security guard at the site.